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[Bazel] Support for feature debug fission in emsdk-bazel-toolchain #1479

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@trzeciak

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@trzeciak

This is a feature request to add support for Debug Fission (dwarf-5 in separated .dwo/.dwp file), in emsdk-bazel-toolchain.

From similar reports I've learned that the emscripten team is not currently maintaining a toolchain for bazel, but maybe someone else has it partly ready?

The motivation for this fr is to improve the developer experience of debugging C++ applications in WebAssembly by reducing linking times and reducing the time needed to parse symbol files by devtools.

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