turn off string tail merging by default in lld-link?

[amykhuang]

Recently I found that string tail merging causes an ASan false positive crashes on Windows (#62078). This crash came up in gtest code, and I assume it would not be too difficult to run into.

Chromium also disables string tail merging because it increases compressed binary size (crbug.com/838449).

Currently string tail merging is on by default when ICF is on. Given these issues, does it make sense to disable string tail merging by default?

[llvmbot]

@llvm/issue-subscribers-lld-coff

[rnk]

+1, I think it would make sense to make string tail merging its own feature.

From a high level, ASan should ideally just work out of the box without magic linker flags like /opt:nolldtailmerge.