[clang] [Frontend] Consolidate frontend timer setup in CompilerInstance::ExecuteAction. NFC (PR #192266)

[Aaron Ballman via cfe-commits]

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@@ -220,6 +220,13 @@ class CompilerInstance : public ModuleLoader {
   /// @name High-Level Operations
   /// @{
 
+  // FIXME: Add a static InitializeProcess() method to consolidate process-level
+  // setup that is currently scattered across tool entry points (cc1_main,
+  // clang-repl, libclang, etc.). This would include things like AsmParsers and
+  // install_fatal_error_handler.
+  // These are process-global, so a single static method would  all clang-based
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AaronBallman wrote:

```suggestion
  // These are process-global, so a single static method would allow clang-based
```

https://github.com/llvm/llvm-project/pull/192266