[WebAssembly] Use DebugValueManager only when subprogram exists (#77978) We previously scanned the whole BB for `DBG_VALUE` instruction even when the program doesn't have debug info, i.e., the function doesn't have a subprogram associated with it, which can make compilation unnecessarily slow. This disables `DebugValueManager` when a `DISubprogram` doesn't exist for a function. This only reduces unnecessary work in non-debug mode and does not change output, so it's hard to add a test to test this behavior. Test changes were necessary because their `DISubprogram`s were not correctly linked with the functions, so with this PR the compiler incorrectly assumed the functions didn't have a subprogram and the tests started to fail. Fixes https://github.com/emscripten-core/emscripten/issues/21048.
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