[NFC][X86] Fix Werror=extra error due to enum

This is one of the many PRs to fix errors with LLVM_ENABLE_WERROR=on. Built by GCC 11.

Fix warnings:
llvm-project/llvm/lib/Target/X86/X86FastISel.cpp: In member function ‘virtual bool {anonymous}::X86FastISel::fastLowerCall(llvm::FastISel::CallLoweringInfo&)’:
llvm-project/llvm/lib/Target/X86/X86FastISel.cpp:3547: error: enumerated and non-enumerated type in conditional expression [-Werror=extra]
 3547 |       MIB.addReg(Is64Bit ? X86::RIP : 0).addImm(1).addReg(0);

Author: jsji

llvm/lib/Target/X86/X86FastISel.cpp

@@ -3544,7 +3544,7 @@ bool X86FastISel::fastLowerCall(CallLoweringInfo &CLI) {
 
     MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, MIMD, TII.get(CallOpc));
     if (NeedLoad)
-      MIB.addReg(Is64Bit ? X86::RIP : 0).addImm(1).addReg(0);
+      MIB.addReg(Is64Bit ? X86::RIP : X86::NoRegister).addImm(1).addReg(0);
     if (Symbol)
       MIB.addSym(Symbol, OpFlags);
     else

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -29986,7 +29986,7 @@ static SDValue LowerShift(SDValue Op, const X86Subtarget &Subtarget,
           MVT::getVectorVT(NarrowScalarVT, WideNumElts), dl, AmtWideElts);
       AmtWide = DAG.getZExtOrTrunc(AmtWide, dl, WideVT);
       // Perform the actual shift.
-      unsigned LogicalOpc = Opc == ISD::SRA ? ISD::SRL : Opc;
+      unsigned LogicalOpc = Opc == ISD::SRA ? (unsigned)ISD::SRL : Opc;
       SDValue ShiftedR = DAG.getNode(LogicalOpc, dl, WideVT, RWide, AmtWide);
       // Now we need to construct a mask which will "drop" bits that get
       // shifted past the LSB/MSB. For a logical shift left, it will look