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

[Alexander Richardson via cfe-commits]

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@@ -1350,7 +1352,12 @@ runThinLTOBackend(CompilerInstance &CI, ModuleSummaryIndex *CombinedIndex,
   assert(OptLevelOrNone && "Invalid optimization level!");
   Conf.CGOptLevel = *OptLevelOrNone;
   Conf.OptLevel = CGOpts.OptimizationLevel;
-  initTargetOptions(CI, Diags, Conf.Options);
+  Conf.InitTargetOptions = [&](llvm::Triple TheTriple) -> llvm::TargetOptions {
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arichardson wrote:

```suggestion
  Conf.InitTargetOptions = [&](const llvm::Triple &TheTriple) -> llvm::TargetOptions {
```

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