* common.opt (fcx-limited-range): Add SetByCombined flag.
(ffinite-math-only, fmath-errno, frounding-math): Likewise.
(fsignaling-nans, fsigned-zeros, ftrapping-math): Likewise.
(fassociative-math, freciprocal-math): Likewise.
(funsafe-math-optimizations): Likewise.
* opth-gen.awk: Handle SetByCombined.
* optc-gen.awk: Likewise.
* opts.c (set_fast_math_flags): Don't override flag if set by
frontend.
(set_unsafe_math_optimizations_flags): Likewise.
* doc/options.texi (Option properties): Document SetByCombined.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@169930
138bc75d-0d04-0410-961f-
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