Adapted from egcs development sources, courtesy of Zack Weinberg, with

some help from him.

Let gcc generate more sensible code for stack adjustments.

Specifically, gcc is a bit lame in that area, as it does emit stack
instructions `specially', without using all its optimizer machinery for it.
So, at times, you will get

subl %esp,12
subl %esp,8

and other such stupid sequences out of it.

This peephole matches at least some of those innane sequences and optimizes
them.

Shrinks code a little bit.

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