[AArch64] Remove header dependencies of AArch64ISelLowering.h. NFC

This patch aims to reduce the include used by AArch64ISelLowering, allowing it
to be included by unittests so that they can reference the AArch64ISD nodes.
It:
 - Moves the inclusion of AArch64SMEAttributes.h to the uses.
 - Moves LowerPtrAuthGlobalAddressStatically to a static function, so that
   AArch64PACKey is not required in the header.
 - Moves the definitions of getExceptionPointerRegister to the cpp file, to
   remove the reference of AArch64::X0.

Author: davemgreen

llvm/lib/Target/AArch64/AArch64FastISel.cpp

@@ -19,6 +19,7 @@
 #include "AArch64Subtarget.h"
 #include "MCTargetDesc/AArch64AddressingModes.h"
 #include "Utils/AArch64BaseInfo.h"
+#include "Utils/AArch64SMEAttributes.h"
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/DenseMap.h"

llvm/lib/Target/AArch64/AArch64FrameLowering.cpp

@@ -212,6 +212,7 @@
 #include "AArch64TargetMachine.h"
 #include "MCTargetDesc/AArch64AddressingModes.h"
 #include "MCTargetDesc/AArch64MCTargetDesc.h"
+#include "Utils/AArch64SMEAttributes.h"
 #include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/Statistic.h"

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

@@ -19,6 +19,7 @@
 #include "AArch64Subtarget.h"
 #include "MCTargetDesc/AArch64AddressingModes.h"
 #include "Utils/AArch64BaseInfo.h"
+#include "Utils/AArch64SMEAttributes.h"
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/ArrayRef.h"
@@ -10082,9 +10083,9 @@ SDValue AArch64TargetLowering::LowerGlobalTLSAddress(SDValue Op,
 // Thus, it's only used for ptrauth references to extern_weak to avoid null
 // checks.
 
-SDValue AArch64TargetLowering::LowerPtrAuthGlobalAddressStatically(
+static SDValue LowerPtrAuthGlobalAddressStatically(
     SDValue TGA, SDLoc DL, EVT VT, AArch64PACKey::ID KeyC,
-    SDValue Discriminator, SDValue AddrDiscriminator, SelectionDAG &DAG) const {
+    SDValue Discriminator, SDValue AddrDiscriminator, SelectionDAG &DAG) {
   const auto *TGN = cast<GlobalAddressSDNode>(TGA.getNode());
   assert(TGN->getGlobal()->hasExternalWeakLinkage());
 
@@ -27574,6 +27575,22 @@ AArch64TargetLowering::getSafeStackPointerLocation(IRBuilderBase &IRB) const {
   return TargetLowering::getSafeStackPointerLocation(IRB);
 }
 
+/// If a physical register, this returns the register that receives the
+/// exception address on entry to an EH pad.
+Register AArch64TargetLowering::getExceptionPointerRegister(
+    const Constant *PersonalityFn) const {
+  // FIXME: This is a guess. Has this been defined yet?
+  return AArch64::X0;
+}
+
+/// If a physical register, this returns the register that receives the
+/// exception typeid on entry to a landing pad.
+Register AArch64TargetLowering::getExceptionSelectorRegister(
+    const Constant *PersonalityFn) const {
+  // FIXME: This is a guess. Has this been defined yet?
+  return AArch64::X1;
+}
+
 bool AArch64TargetLowering::isMaskAndCmp0FoldingBeneficial(
     const Instruction &AndI) const {
   // Only sink 'and' mask to cmp use block if it is masking a single bit, since

llvm/lib/Target/AArch64/AArch64ISelLowering.h

@@ -14,8 +14,6 @@
 #ifndef LLVM_LIB_TARGET_AARCH64_AARCH64ISELLOWERING_H
 #define LLVM_LIB_TARGET_AARCH64_AARCH64ISELLOWERING_H
 
-#include "AArch64.h"
-#include "Utils/AArch64SMEAttributes.h"
 #include "llvm/CodeGen/CallingConvLower.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/SelectionDAG.h"
@@ -830,18 +828,12 @@ class AArch64TargetLowering : public TargetLowering {
   /// If a physical register, this returns the register that receives the
   /// exception address on entry to an EH pad.
   Register
-  getExceptionPointerRegister(const Constant *PersonalityFn) const override {
-    // FIXME: This is a guess. Has this been defined yet?
-    return AArch64::X0;
-  }
+  getExceptionPointerRegister(const Constant *PersonalityFn) const override;
 
   /// If a physical register, this returns the register that receives the
   /// exception typeid on entry to a landing pad.
   Register
-  getExceptionSelectorRegister(const Constant *PersonalityFn) const override {
-    // FIXME: This is a guess. Has this been defined yet?
-    return AArch64::X1;
-  }
+  getExceptionSelectorRegister(const Constant *PersonalityFn) const override;
 
   bool isIntDivCheap(EVT VT, AttributeList Attr) const override;
 
@@ -1132,11 +1124,6 @@ class AArch64TargetLowering : public TargetLowering {
                                  SelectionDAG &DAG) const;
   SDValue LowerWindowsGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
   SDValue LowerPtrAuthGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
-  SDValue LowerPtrAuthGlobalAddressStatically(SDValue TGA, SDLoc DL, EVT VT,
-                                              AArch64PACKey::ID Key,
-                                              SDValue Discriminator,
-                                              SDValue AddrDiscriminator,
-                                              SelectionDAG &DAG) const;
   SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
   SDValue LowerSETCCCARRY(SDValue Op, SelectionDAG &DAG) const;
   SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;

llvm/lib/Target/AArch64/AArch64SelectionDAGInfo.cpp

@@ -11,6 +11,8 @@
 //===----------------------------------------------------------------------===//
 
 #include "AArch64TargetMachine.h"
+#include "Utils/AArch64SMEAttributes.h"
+
 using namespace llvm;
 
 #define DEBUG_TYPE "aarch64-selectiondag-info"

llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp

@@ -10,6 +10,7 @@
 #include "AArch64ExpandImm.h"
 #include "AArch64PerfectShuffle.h"
 #include "MCTargetDesc/AArch64AddressingModes.h"
+#include "Utils/AArch64SMEAttributes.h"
 #include "llvm/Analysis/IVDescriptors.h"
 #include "llvm/Analysis/LoopInfo.h"
 #include "llvm/Analysis/TargetTransformInfo.h"

llvm/lib/Target/AArch64/GISel/AArch64CallLowering.cpp

@@ -18,6 +18,7 @@
 #include "AArch64MachineFunctionInfo.h"
 #include "AArch64RegisterInfo.h"
 #include "AArch64Subtarget.h"
+#include "Utils/AArch64SMEAttributes.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Analysis/ObjCARCUtil.h"