New option -flimit-function-alignment

[Bernd Schmidt]

Denys has submitted some patches to add more capabilities to the 
-falign-* options, but these still have some issues, and the original 
ideas seems to have been to allow for large alignments without 
over-aligning small functions. The following patch implements that idea 
by taking into account the function size as computed during 
shorten_branches: let's say we use "-falign-functions=128 
-flimit-function-alignment", then a 15-byte function will be 16-byte 
aligned rather than 128-byte aligned.

Bootstrapped and tested on x86_64-linux. Denys, does this solve your 
problem? Anyone else, ok to commit?


Bernd
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