[Bug rtl-optimization/64304] AArch64 miscompilation with -mgeneral-regs-only

[jiwang at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64304

--- Comment #3 from Jiong Wang <jiwang at gcc dot gnu.org> ---
cased by one bug in combine pass.

patch under review at https://gcc.gnu.org/ml/gcc-patches/2015-01/msg00508.html