Experimenting with tree inliner parameter settings

[Richard Guenther]

[Summary / analysis of inline params snipped]

The SPEC results show, that at least defaults for C and Fortran do not
necessarily apply to C++ code (as the testcases from the PRs show).

So may I suggest again splitting the defaults per language? Especially for
templated C++ code with exceptions the instruction counting can be _very_
wrong.

Richard.