[lld] [LLD] [Build Issue] Ubuntu24 build failure due to LLD's COFF regression (PR #98447)

[Vikash Gupta via llvm-commits]

vg0204 wrote:

> I think there's a real bug here.
> 
> It seems extremely sketchy that we don't initialize `isUsedInRegularObj` in the Symbol constructor, but that must be intentional. I'm pretty sure the compiler is entitled to zero initialize the whole object during the constructor, and that may be what @vg0204 is observing with some new GCC version on Ubuntu 24. And, with that toolchain, the bug is reliably observable in the regression test suite.
> 
> If we zero initialize the member in all builds, does that cause tests to fail, and then does this patch fix it? I think that's the next thing to try here.

Will do that right away!

https://github.com/llvm/llvm-project/pull/98447