[clang] [Clang] Initialize bypassed variables w/ trivial-auto-var-init (PR #181937)

[Eli Friedman via cfe-commits]

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@@ -1749,6 +1757,8 @@ void CodeGenFunction::EmitCaseStmtRange(const CaseStmt &S,
   // switch machinery to enter this block.
   llvm::BasicBlock *CaseDest = createBasicBlock("sw.bb");
   EmitBlockWithFallThrough(CaseDest, &S);
+  if (getLangOpts().CPlusPlus)
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efriedma-quic wrote:

Do we also need to check `!Bypasses.isAlwaysBypassed()` here, and other similar places?  If I'm understanding correctly, EmitAutoVarAlloca flips to the C-style rules for any function containing a computed goto.

https://github.com/llvm/llvm-project/pull/181937