[GISEL][NFC] Use getElementCount instead of getNumElements in more places

These cases in particular are  done as a precommit to support
legalization, regbank selection, and instruction selection for extends,
splat vectors, and integer compares in #85938.

Author: michaelmaitland

llvm/lib/CodeGen/GlobalISel/LegalizerInfo.cpp

@@ -154,7 +154,8 @@ static bool mutationIsSane(const LegalizeRule &Rule,
   case WidenScalar: {
     if (OldTy.isVector()) {
       // Number of elements should not change.
-      if (!NewTy.isVector() || OldTy.getNumElements() != NewTy.getNumElements())
+      if (!NewTy.isVector() ||
+          OldTy.getElementCount() != NewTy.getElementCount())
         return false;
     } else {
       // Both types must be vectors

llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp

@@ -1160,7 +1160,7 @@ void MachineIRBuilder::validateSelectOp(const LLT ResTy, const LLT TstTy,
   else
     assert((TstTy.isScalar() ||
             (TstTy.isVector() &&
-             TstTy.getNumElements() == Op0Ty.getNumElements())) &&
+             TstTy.getElementCount() == Op0Ty.getElementCount())) &&
            "type mismatch");
 #endif
 }

llvm/lib/CodeGen/LowLevelTypeUtils.cpp

@@ -51,7 +51,7 @@ MVT llvm::getMVTForLLT(LLT Ty) {
 
   return MVT::getVectorVT(
       MVT::getIntegerVT(Ty.getElementType().getSizeInBits()),
-      Ty.getNumElements());
+      Ty.getElementCount());
 }
 
 EVT llvm::getApproximateEVTForLLT(LLT Ty, const DataLayout &DL,

llvm/lib/CodeGen/MachineVerifier.cpp

@@ -1506,7 +1506,8 @@ void MachineVerifier::verifyPreISelGenericInstruction(const MachineInstr *MI) {
     LLT SrcTy = MRI->getType(MI->getOperand(2).getReg());
 
     if ((DstTy.isVector() != SrcTy.isVector()) ||
-        (DstTy.isVector() && DstTy.getNumElements() != SrcTy.getNumElements()))
+        (DstTy.isVector() &&
+         DstTy.getElementCount() != SrcTy.getElementCount()))
       report("Generic vector icmp/fcmp must preserve number of lanes", MI);
 
     break;

llvm/lib/CodeGen/RegisterBankInfo.cpp

@@ -484,9 +484,10 @@ void RegisterBankInfo::applyDefaultMapping(const OperandsMapper &OpdMapper) {
       // the storage. However, right now we don't necessarily bump all
       // the types to storage size. For instance, we can consider
       // s16 G_AND legal whereas the storage size is going to be 32.
-      assert(OrigTy.getSizeInBits() <= NewTy.getSizeInBits() &&
-             "Types with difference size cannot be handled by the default "
-             "mapping");
+      assert(
+          TypeSize::isKnownLE(OrigTy.getSizeInBits(), NewTy.getSizeInBits()) &&
+          "Types with difference size cannot be handled by the default "
+          "mapping");
       LLVM_DEBUG(dbgs() << "\nChange type of new opd from " << NewTy << " to "
                         << OrigTy);
       MRI.setType(NewReg, OrigTy);