wasm-opt crash with module with try + dwarf since emcc 6.0.2

[hoodmane]

Most likely due to #8862.

Source file:

# a.cpp
#include <sstream>
int main() { 
    std::ostringstream s; 
    return 0; 
}

Shell commands:

$ em++ -g -fwasm-exceptions a.cpp
$ ~/cpython/emsdk-cache/6.0.2/emsdk/upstream/bin/wasm-opt -g a.out.wasm  -o res.wasm
warning: no passes specified, not doing any work
wasm-opt: /b/s/w/ir/cache/builder/emscripten-releases/binaryen/src/wasm/wasm-debug.cpp:439: void wasm::Debug::AddrExprMap::add(Expression *, const BinaryLocations::Span): Assertion `!endMap.contains(span.end)' failed.
Aborted (core dumped)

Or:

$ em++ -g -O2 -fwasm-exceptions a.cpp
em++: warning: running limited binaryen optimizations because DWARF info requested (or indirectly required) [-Wlimited-postlink-optimizations]
wasm-opt: /b/s/w/ir/cache/builder/emscripten-releases/binaryen/src/wasm/wasm-debug.cpp:439: void wasm::Debug::AddrExprMap::add(Expression *, const BinaryLocations::Span): Assertion `!endMap.contains(span.end)' failed.
em++: error: '/home/hood/cpython/emsdk-cache/6.0.2/emsdk/upstream/bin/wasm-opt --strip-target-features --post-emscripten -O2 --low-memory-unused --zero-filled-memory --pass-arg=directize-initial-contents-immutable t.wasm -o t.wasm -g --mvp-features --enable-bulk-memory --enable-bulk-memory-opt --enable-call-indirect-overlong --enable-exception-handling --enable-multivalue --enable-mutable-globals --enable-nontrapping-float-to-int --enable-reference-types --enable-sign-ext' failed (received SIGABRT (-6))

[kripken]

Hmm, I can't reproduce a problem using emcc 6.0.4-git. Perhaps it was a temporary LLVM regression?

If you still see this on trunk, please attach the wasm file.

[kripken]

Oh, wait, I wasn't running it right. Reproduced, bisecting now.