[lld][WebAssembly] Implement --why-extract flag from the ELF backend
See https://reviews.llvm.org/D109572 for the original ELF version. Differential Revision: https://reviews.llvm.org/D145431
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71b38063
See https://reviews.llvm.org/D109572 for the original ELF version. Differential Revision: https://reviews.llvm.org/D145431
mentioned in commit 9c865c23
·mentioned in commit 9c865c23