wasm-emscripten-finalize: Make EM_ASM modifications optional (#3044)

wasm-emscripten-finalize renames EM_ASM calls to have the signature in
the name. This isn't actually useful - emscripten doesn't benefit from that. I
think it was optimized in fastcomp, and in upstream we copied the general
form but not the optimizations, and then EM_JS came along which is
easier to optimize anyhow.

This PR makes those changes optional: when not doing them, it just
leaves the calls as they are. Emscripten will need some changes to
handle that, but those are simple.

For convenience this adds a flag to "minimize wasm changes". The idea
is that this flag avoids needing a double-roll or other inconvenience
as the changes need to happen in tandem on the emscripten side.
The same flag can be reused for later changes similar to this one.
When they are all done we can remove the flag. (Note how the code
ifdefed by the flag can be removed once we no longer need the old
way of doing things - that is, the new approach is simpler on the
binaryen side).

See #3043

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