Patch: rs6000-specific ICE

[David Edelsohn]

>>>>> Dale Johannesen writes:

Dale> It's true I couldn't make it fail without -ffast-math, but there is no
Dale> dependency on that in the pattern or the matching functions.  I'll need
Dale> to look further to convince myself the problem inputs never arise
Dale> without -ffast-math.

	I assumed you knew that this ICE is PR target/7133.  The failure
requires -ffast-math.

David