Skip pidigits if --llvm is a COMPOPTS flag.
Revert "Skip pidigits if --llvm is a COMPOPTS flag."

This reverts commit 7fda53560785eeec13c165e43f303bce60a26707.
Disable gmp when running llvm tests.

suggested by @lydia-duncan
Merge pull request #487 from thomasvandoren/disable-pidigits-for-llvm

Disable pidigits for llvm

suggested by @lydia-duncan