[RISCV] TableGen RISC-V ISD Nodes

This commit moves RISC-V to auto-generate its target-specific SDNode
types. The biggest change is that SDNodes can now be validated against
their expected type profiles, and that we don't need to edit several
different files when declaring a new one.

This takes Sergei's work in llvm#119709 and "finishes" it - by moving the
final five RISCVISD opcodes into tablegen (including defining their
types), and by ensuring the tablegen has expected closing scope
comments.

Only one opcode is not currently verifying on the in-tree tests:
PROBED_ALLOCA, which I cannot make head or tail of what it should be
doing, so I have just ensured it skips verification for the moment (as
in Sergei's patch).

Co-authored-by: Sergei Barannikov <[email protected]>

Author: lenary

llvm/lib/Target/RISCV/CMakeLists.txt

@@ -16,6 +16,7 @@ tablegen(LLVM RISCVGenRegisterInfo.inc -gen-register-info)
 tablegen(LLVM RISCVGenSearchableTables.inc -gen-searchable-tables)
 tablegen(LLVM RISCVGenSubtargetInfo.inc -gen-subtarget)
 tablegen(LLVM RISCVGenExegesis.inc -gen-exegesis)
+tablegen(LLVM RISCVGenSDNodeInfo.inc -gen-sd-node-info)
 
 set(LLVM_TARGET_DEFINITIONS RISCVGISel.td)
 tablegen(LLVM RISCVGenGlobalISel.inc -gen-global-isel)

llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp

@@ -11,6 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "RISCVISelDAGToDAG.h"
+#include "RISCVSelectionDAGInfo.h"
 #include "MCTargetDesc/RISCVBaseInfo.h"
 #include "MCTargetDesc/RISCVMCTargetDesc.h"
 #include "MCTargetDesc/RISCVMatInt.h"
@@ -34,6 +35,9 @@ static cl::opt<bool> UsePseudoMovImm(
              "constant materialization"),
     cl::init(false));
 
+#define GET_DAGISEL_BODY RISCVDAGToDAGISel
+#include "RISCVGenDAGISel.inc"
+
 void RISCVDAGToDAGISel::PreprocessISelDAG() {
   SelectionDAG::allnodes_iterator Position = CurDAG->allnodes_end();
 

llvm/lib/Target/RISCV/RISCVISelDAGToDAG.h

@@ -191,6 +191,7 @@ class RISCVDAGToDAGISel : public SelectionDAGISel {
   }
 
 // Include the pieces autogenerated from the target description.
+#define GET_DAGISEL_DECL
 #include "RISCVGenDAGISel.inc"
 
 private: