[clang] [codegen] Emit missing cleanups for stmt-expr and coro suspensions [take-2] (PR #85398)

[Richard Smith via cfe-commits]

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@@ -2503,6 +2506,29 @@ Stmt *BlockExpr::getBody() {
 // Generic Expression Routines
 //===----------------------------------------------------------------------===//
 
+bool Expr::mayBranchOut() const {
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zygoloid wrote:

Computing this seems a little expensive in general. I wonder if we could track a bit on `FunctionDecl` that indicates whether it contains any branches out of statement expressions, and skip calling this if the enclosing function is not a coroutine and does not contain branches out of statement expressions.

https://github.com/llvm/llvm-project/pull/85398