[Bug target/63404] [5 Regression] gcc 5 miscompiles linux block layer

[jiwang at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63404

--- Comment #5 from Jiong Wang <jiwang at gcc dot gnu.org> ---
we need to check the following 

   else if (GET_CODE == CLOBBER
            || GET_CODE (x) == USE
            || GET_CODE (x) == ASM_INPUT)

I will post the fix after pass x86 bootstrap and regression