[clang] [flang] [flang][driver] Introduce FCC_OVERRIDE_OPTIONS. (PR #140556)

[Abid Qadeer via cfe-commits]

abidh wrote:

> Does `CCC_OVERRIDE_OPTIONS` expands to Clang Compiler Commandline Override Options? If so `FCC_OVERRIDE_OPTIONS` expanding to Fortran Compiler Commandline Override Options seems the right replacement.
> 
> If `CCC_OVERRIDE_OPTIONS` expands to Clang C Compiler Override Options then `FFC_OVERRIDE_OPTIONS` (as suggested by @tarunprabhu) expanding to Flang Fortran Compiler Overrided Options is better.

The `CCC_OVERRIDE_OPTIONS` was introduced in a19fad as replacement of `QA_OVERRIDE_GCC3_OPTIONS`.  I am not sure if there is a definite word on what it actually expands to. I am happy with either of them.


https://github.com/llvm/llvm-project/pull/140556