[SVE]Fix implicit TypeSize casts in EmitCheckValue

[CarolineConcatto]

Summary

Using TypeSize::getFixedSize() instead of relying upon the implicit TypeSize->uint64_cast as the type is always fixed width.

clang/lib/CodeGen/CGExpr.cpp

llvm::Value *CodeGenFunction::EmitCheckValue(llvm::Value *V) {
   llvm::Type *TargetTy = IntPtrTy;
 
   if (V->getType() == TargetTy)
     return V;
 
   // Floating-point types which fit into intptr_t are bitcast to integers
   // and then passed directly (after zero-extension, if necessary).
   if (V->getType()->isFloatingPointTy()) {
-    unsigned Bits = V->getType()->getPrimitiveSizeInBits();
+    unsigned Bits = V->getType()->getPrimitiveSizeInBits().getFixedSize();
     if (Bits <= TargetTy->getIntegerBitWidth())
       V = Builder.CreateBitCast(V, llvm::Type::getIntNTy(getLLVMContext(),
                                                          Bits));
   }
 
   // Integers which fit in intptr_t are zero-extended and passed directly.
   if (V->getType()->isIntegerTy() &&
       V->getType()->getIntegerBitWidth() <= TargetTy->getIntegerBitWidth())