[LLVM][TableGen] Minor cleanup in CGIOperandList (#142721)

- Change `hadOperandNamed` to return index as std::optional and rename
it to `findOperandNamed`.
- Change `SubOperandAlias` to return std::optional and rename it to
`findSubOperandAlias`.

1 files changed, 4 insertions, 5 deletions

diff --git a/llvm/utils/TableGen/CodeEmitterGen.cpp b/llvm/utils/TableGen/CodeEmitterGen.cpp
index 2fe40450abfd..14dffb438fcb 100644
--- a/llvm/utils/TableGen/CodeEmitterGen.cpp
+++ b/llvm/utils/TableGen/CodeEmitterGen.cpp
@@ -123,12 +123,11 @@ bool CodeEmitterGen::addCodeToMergeInOperand(const Record *R,
   // operand number. Non-matching operands are assumed to be in
   // order.
   unsigned OpIdx;
-  std::pair<unsigned, unsigned> SubOp;
-  if (CGI.Operands.hasSubOperandAlias(VarName, SubOp)) {
-    OpIdx = CGI.Operands[SubOp.first].MIOperandNo + SubOp.second;
-  } else if (CGI.Operands.hasOperandNamed(VarName, OpIdx)) {
+  if (auto SubOp = CGI.Operands.findSubOperandAlias(VarName)) {
+    OpIdx = CGI.Operands[SubOp->first].MIOperandNo + SubOp->second;
+  } else if (auto MayBeOpIdx = CGI.Operands.findOperandNamed(VarName)) {
     // Get the machine operand number for the indicated operand.
-    OpIdx = CGI.Operands[OpIdx].MIOperandNo;
+    OpIdx = CGI.Operands[*MayBeOpIdx].MIOperandNo;
   } else {
     PrintError(R, Twine("No operand named ") + VarName + " in record " +
                       R->getName());