[clang] [CIR] Defer indirect goto resolution to GotoSolver (PR #206176)

[via cfe-commits]

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@@ -706,13 +706,22 @@ mlir::LogicalResult CIRGenFunction::emitGotoStmt(const clang::GotoStmt &s) {
 
 mlir::LogicalResult
 CIRGenFunction::emitIndirectGotoStmt(const IndirectGotoStmt &s) {
+  // An indirect goto that branches out of a scope needing cleanup (a VLA stack
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Andres-Salamanca wrote:

In Classic CodeGen, if it detects
```cpp
if (const LabelDecl *Target = S.getConstantTarget()) {
```
it emits an EmitBranchThroughCleanup() directly to the target label. Should we support the same case here as well?
Also, related to cleanups, I think we should add support for GotoIndirectOp in `CIRCleanupScopeOpFlattening::collectExits()` so indirect gotos are also collected when leaving a cleanup scope. @andykaylor, please correct me if I'm missing something here

https://github.com/llvm/llvm-project/pull/206176