patch: signal trampoline frame cache corruption (repost?)

[PAUL GILLIAM]

This might be a repost.  

Attached is a patch to fix some signal trampoline frame cache corruption
that occurs on machines that have no FPU registers.  The corruption was
reported when running gdb 6.4 on a PowerPC 440.  If a backtrace command
was run after hitting a signal trampoline frame, the frame cache would
become corrupted and GDB would SIGSEGV.

I have checked the cvs head sources, and the code has moved, but has not
been fixed.  So I updated the patch to apply to cvs head.

Ok to commit?  (This is almost an obvious fix, isn't it?)


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