[Parser] Support prologue and epilogue sourcemap annotations (#6370)

and fix a bug with sourcemap annotations on folded `if` conditions. Update
IRBuilder to apply prologue and epilogue source locations when beginning and ending
a function scope. Add basic support in the parser for explicitly tracking
annotations on module fields, although only do anything with them in the case of
prologue source location annotations.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/parser/wat-parser.cpp b/src/parser/wat-parser.cpp
index ff0dea768..8675f4e36 100644
--- a/src/parser/wat-parser.cpp
+++ b/src/parser/wat-parser.cpp
@@ -184,10 +184,11 @@ Result<> parseModule(Module& wasm, std::string_view input) {
     for (Index i = 0; i < decls.funcDefs.size(); ++i) {
       ctx.index = i;
       auto* f = wasm.functions[i].get();
+      WithPosition with(ctx, decls.funcDefs[i].pos);
+      ctx.setSrcLoc(decls.funcDefs[i].annotations);
       if (!f->imported()) {
         CHECK_ERR(ctx.visitFunctionStart(f));
       }
-      WithPosition with(ctx, decls.funcDefs[i].pos);
       if (auto parsed = func(ctx)) {
         CHECK_ERR(parsed);
       } else {