[clang] [llvm] [WebAssembly] Implement an alternative translation for -wasm-enable-sjlj (PR #84137)

[Heejin Ahn via cfe-commits]

================
@@ -198,9 +198,18 @@
 ///
 /// If there are calls to setjmp()
 ///
-/// 2) and 3): The same as 2) and 3) in Emscripten SjLj.
-/// (setjmpTable/setjmpTableSize initialization + setjmp callsite
-/// transformation)
+/// 2) In the function entry that calls setjmp, initialize
+///    functionInvocationId as follows:
+///
+///    functionInvocationId = alloca()
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aheejin wrote:

Yes. The combination of function invocation ID + callsite determines the unique `setjmp` call, in my understanding.

https://github.com/llvm/llvm-project/pull/84137