As clang doesn't support function in-lining, this gcc flag can safely
ignored. Note: some sloppy Makefiles set the flag without a value.
Both of these arguments are now ignored and tests have been updated as appropriate.
One alternative is to recognize the flag, but warn on it. An easy way to do this with a poor diagnostic experience is to simply add it to our option table, don't put it into clang_ignored_f_Group, and don't check it in the driver. Clang will emit 'warning: argument unused during compilation '-finline-limit=1234''.
For extra credit, we could have a diagnostic like "ignoring GCC optimization tuning flag" and use that for all GCC optimization flags that don't have analogues in Clang/LLVM.
This should be finline_limit_EQ.