Patch: Omit frame pointers on x86

[Bryce McKinlay]

Previously, stack traces on i386 required a frame pointer to be 
available as a fallback mechansim when tracing the stack. The new stack 
trace infrastructure uses DWARF2 unwind info exclusively, so frame 
pointers are never required on systems that support DWARF2 unwind. 
Omitting frame pointers frees up a register for general purpose use, 
which should improve peformance and reduce code size slightly.

-fno-omit-frame-pointer is actually still the default on 32-bit x86, so 
this patch will now explicitly specify -fomit-frame-pointer for that 
platform, except on Windows. On 64-bit x86, no frame pointer is the 
default, so we don't need to specify anything.

I'm checking this in to HEAD.

Bryce

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