Fix misc uses of "long" variables to use "int64_t".

I don't have any evidence these particular uses are actually causing any
issues, but we should avoid accidentally truncating immediate values
depending on the host.

llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp

@@ -3865,7 +3865,7 @@ bool AMDGPUAsmParser::validateMIMGDim(const MCInst &Inst) {
   if (DimIdx < 0)
     return true;
 
-  long Imm = Inst.getOperand(DimIdx).getImm();
+  int64_t Imm = Inst.getOperand(DimIdx).getImm();
   if (Imm < 0 || Imm >= 8)
     return false;
 

llvm/lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp

@@ -177,7 +177,7 @@ encodeInstruction(const MCInst &MI, raw_ostream &OS,
     LowerCompactBranch(TmpInst);
   }
 
-  unsigned long N = Fixups.size();
+  size_t N = Fixups.size();
   uint32_t Binary = getBinaryCodeForInstr(TmpInst, Fixups, STI);
 
   // Check for unimplemented opcodes.

llvm/lib/Target/PowerPC/PPCFastISel.cpp

@@ -74,7 +74,7 @@ struct Address {
     int FI;
   } Base;
 
-  long Offset;
+  int64_t Offset;
 
   // Innocuous defaults for our address.
   Address()
@@ -338,7 +338,7 @@ bool PPCFastISel::PPCComputeAddress(const Value *Obj, Address &Addr) {
       break;
     case Instruction::GetElementPtr: {
       Address SavedAddr = Addr;
-      long TmpOffset = Addr.Offset;
+      int64_t TmpOffset = Addr.Offset;
 
       // Iterate through the GEP folding the constants into offsets where
       // we can.
@@ -437,8 +437,7 @@ void PPCFastISel::PPCSimplifyAddress(Address &Addr, bool &UseOffset,
 
   if (!UseOffset) {
     IntegerType *OffsetTy = Type::getInt64Ty(*Context);
-    const ConstantInt *Offset =
-      ConstantInt::getSigned(OffsetTy, (int64_t)(Addr.Offset));
+    const ConstantInt *Offset = ConstantInt::getSigned(OffsetTy, Addr.Offset);
     IndexReg = PPCMaterializeInt(Offset, MVT::i64);
     assert(IndexReg && "Unexpected error in PPCMaterializeInt!");
   }

llvm/lib/Target/PowerPC/PPCISelLowering.cpp

@@ -15415,7 +15415,7 @@ SDValue PPCTargetLowering::PerformDAGCombine(SDNode *N,
       MachineFunction &MF = DAG.getMachineFunction();
       MachineMemOperand *BaseMMO =
         MF.getMachineMemOperand(LD->getMemOperand(),
-                                -(long)MemVT.getStoreSize()+1,
+                                -(int64_t)MemVT.getStoreSize()+1,
                                 2*MemVT.getStoreSize()-1);
 
       // Create the new base load.

llvm/lib/Target/PowerPC/PPCInstrInfo.td

@@ -478,7 +478,7 @@ def HI16 : SDNodeXForm<imm, [{
 
 def HA16 : SDNodeXForm<imm, [{
   // Transformation function: shift the immediate value down into the low bits.
-  long Val = N->getZExtValue();
+  int64_t Val = N->getZExtValue();
   return getI32Imm((Val - (signed short)Val) >> 16, SDLoc(N));
 }]>;
 def MB : SDNodeXForm<imm, [{