compile a kernel for kgdb with less "optimized out"

[gaoqiang]

I think those who use kgdb must hate this sentence  "optimized out". I  
have tried many times to build a kernel with less optimization but failed.  
today,I found a trick method ,just get rid of the -O2 and -Os on the top  
level of the kernel source and add -O2  for the  arch/x86 directory,it  
works !.I saw much "optimized out" now.

I build the kernel of centos6, with kernel 2.6.32. I don't know whether it  
works with kernel of other versions ,but it worth a try.
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