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

[Paul Kirth via llvm-commits]

================
@@ -0,0 +1,30 @@
+;; Test that Fuchsia enables TLSDESC by default during LTO.
----------------
ilovepi wrote:

@teresajohnson This should more or less be the equivalent of the `llc` test I added, but for LTO. I added a Fuchsia and Linux version that should have different defaults, but don't prior to this PR. 

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