[clang] [lld] [llvm] [llvm][lld][clang] Delay initializing TargetOptions in LTO builds until a Triple is available (PR #179509)

[Teresa Johnson via cfe-commits]

teresajohnson wrote:

> LGTM, but @teresajohnson should take a look as well.

​I'd still like to see some LTO tests that reflect the changes.

https://github.com/llvm/llvm-project/pull/179509