Sam Clegg 9cd985815a [lld][WebAssembly] Add libcall symbols to the link when LTO is being used. ...

This code is copied almost verbatim from the equivalent change to the
ELF linker:

- https://reviews.llvm.org/D50017
- https://reviews.llvm.org/D50475

The upshot is that libraries containing libcall (such as compiler-rt
and libc) can be compiled with LTO.

Fixes PR41384

Differential Revision: https://reviews.llvm.org/D71738

2020-01-10 11:01:05 -08:00

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