[llvm] [IR] Use pretty printing for mask in is_fpclass (PR #207653)

[Matt Arsenault via llvm-commits]

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@@ -1472,6 +1472,60 @@ Intrinsic::ID Intrinsic::getDeinterleaveIntrinsicID(unsigned Factor) {
   return InterleaveIntrinsics[Factor - 2].Deinterleave;
 }
 
+LLVM_ABI void Intrinsic::printFPClassMask(raw_ostream &OS,
+                                          const Constant *ImmArgVal) {
+  if (const auto *CI = dyn_cast<ConstantInt>(ImmArgVal)) {
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arsenm wrote:

dyn_cast shouldn't be necessary, just pass in the raw integer value to the function 

https://github.com/llvm/llvm-project/pull/207653