[Target] Use llvm::rotl (NFC) (#164144)

Author: kazutakahirata

llvm/lib/Target/AArch64/AArch64ExpandImm.cpp

@@ -585,7 +585,7 @@ void AArch64_IMM::expandMOVImm(uint64_t Imm, unsigned BitSize,
     uint64_t ShiftedMask = (0xFFFFULL << Shift);
     uint64_t ZeroChunk = UImm & ~ShiftedMask;
     uint64_t OneChunk = UImm | ShiftedMask;
-    uint64_t RotatedImm = (UImm << 32) | (UImm >> 32);
+    uint64_t RotatedImm = llvm::rotl(UImm, 32);
     uint64_t ReplicateChunk = ZeroChunk | (RotatedImm & ShiftedMask);
     if (AArch64_AM::processLogicalImmediate(ZeroChunk, BitSize, Encoding) ||
         AArch64_AM::processLogicalImmediate(OneChunk, BitSize, Encoding) ||

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -41846,7 +41846,7 @@ static SDValue combineCommutableSHUFP(SDValue N, MVT VT, const SDLoc &DL,
     if (!X86::mayFoldLoad(peekThroughOneUseBitcasts(N0), Subtarget) ||
         X86::mayFoldLoad(peekThroughOneUseBitcasts(N1), Subtarget))
       return SDValue();
-    Imm = ((Imm & 0x0F) << 4) | ((Imm & 0xF0) >> 4);
+    Imm = llvm::rotl<uint8_t>(Imm, 4);
     return DAG.getNode(X86ISD::SHUFP, DL, VT, N1, N0,
                        DAG.getTargetConstant(Imm, DL, MVT::i8));
   };