[clang] [flang] [flang][flang-driver] Support flag -finstrument-functions (PR #137996)

[Tarun Prabhu via cfe-commits]

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@@ -81,6 +81,9 @@ class CodeGenOptions : public CodeGenOptionsBase {
   /// Options to add to the linker for the object file
   std::vector<std::string> DependentLibs;
 
+  /// Indicates whether -finstrument-functions option is passed
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tarunprabhu wrote:

nit

```suggestion
  /// Indicates whether -finstrument-functions is passed
```

https://github.com/llvm/llvm-project/pull/137996