[clang] [CIR] Add the ability to detect enum argument for switch op (PR #172236)

[Jasmine Tang via cfe-commits]

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@@ -1282,7 +1282,7 @@ void testSwitchCoverAllCase(M m) {
     break;
   }
 }
-// CIR: cir.switch(%[[ARG:.*]] : !s32i) allEnumCasesCovered {
+// CIR: cir.switch(%[[ARG:.*]] : !s32i) allEnumCasesCovered handling_enum {
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badumbatish wrote:

hmm are you saying we should redo the accepting types of switch op and case op? Because currently once switch op is created, the switch operand will turn into i32 without any ways to recover the information. About the enum all cases covered being expensive, I believe it's already available as an unsigned inside the AST already, we're just copying the integer over as a boolean.

https://github.com/llvm/llvm-project/pull/172236