[mlir][spirv] Fix typos related to (de)serialization.

[denis13]

Summary

Fix typos related to (de)serialization of spv.selection.

[antiagainst]

Good catch! Thanks!

[mehdi_amini]

@denis13 : can you please join this group https://reviews.llvm.org/project/members/78/ ; this will enable CI builds on your Phabricator revisions.

mlir/lib/Dialect/SPIRV/Serialization/Deserializer.cpp

 LogicalResult Deserializer::processSelectionMerge(ArrayRef<uint32_t> operands) {
   if (!curBlock) {
     return emitError(unknownLoc, "OpSelectionMerge must appear in a block");
   }
 
   if (operands.size() < 2) {
     return emitError(
         unknownLoc,
-        "OpLoopMerge must specify merge target and selection control");
+        "OpSelectionMerge must specify merge target and selection control");
   }
 
-  if (static_cast<uint32_t>(spirv::LoopControl::None) != operands[1]) {
+  if (static_cast<uint32_t>(spirv::SelectionControl::None) != operands[1]) {
     return emitError(unknownLoc,
                      "unimplmented OpSelectionMerge selection control: ")
            << operands[2];
   }
 
   auto *mergeBlock = getOrCreateBlock(operands[0]);
 
   if (!blockMergeInfo.try_emplace(curBlock, mergeBlock).second) {

mlir/lib/Dialect/SPIRV/Serialization/Serializer.cpp

LogicalResult Serializer::processSelectionOp(spirv::SelectionOp selectionOp) {
   for (Block &block : body)
     getOrCreateBlockID(&block);
 
   auto *headerBlock = selectionOp.getHeaderBlock();
   auto *mergeBlock = selectionOp.getMergeBlock();
   auto mergeID = getBlockID(mergeBlock);
 
   // Emit the selection header block, which dominates all other blocks, first.
-  // We need to emit an OpSelectionMerge instruction before the loop header
+  // We need to emit an OpSelectionMerge instruction before the selection header
   // block's terminator.
   auto emitSelectionMerge = [&]() {
-    // TODO(antiagainst): properly support loop control here
+    // TODO(antiagainst): properly support selection control here
     encodeInstructionInto(
         functionBody, spirv::Opcode::OpSelectionMerge,
-        {mergeID, static_cast<uint32_t>(spirv::LoopControl::None)});
+        {mergeID, static_cast<uint32_t>(spirv::SelectionControl::None)});
   };
   // For structured selection, we cannot have blocks in the selection construct
   // branching to the selection header block. Entering the selection (and
   // reaching the selection header) must be from the block containing the
   // spv.selection op. If there are ops ahead of the spv.selection op in the
   // block, we can "merge" them into the selection header. So here we don't need
   // to emit a separate block; just continue with the existing block.
   if (failed(processBlock(headerBlock, /*omitLabel=*/true, emitSelectionMerge)))