[PATCH, i386] Introduce a flag to generate only 128-bit avx instructions

[Fang, Changpeng]

Hi, 

 Attached is the patch that introduces a new flag, -mavx-m128-only, for gcc to have the ability
to generate only 128-bit avx instructions. This flag (default is off) helps tuning avx performance
as well as benchmarking.  

The patch passed bootstrapping on x86_64-unknown-linux-gnu with "-O3 -g -march=bdver1 
-mavx-m128-only" and the necessary correctness and performance tests.

Is it OK to commit to 4.6 trunk?

Thanks,

Changpeng
 
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