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"If what you care about is compatibility with Apple/MS browsers, then generate JavaScript from your intermediate bitcode/bytecode"

Which is precisely what the Mozilla Emscripten project does.

Emscripten doesn't treat LLVM bitcode as a first-class target, it treats it as an intermediate target to be translated into JavaScript.

[high level language] -> [low level representation] -> [high level language] -> [low level representation] -> [execution]

This is ridiculous to aim for as your first-order target.