lower-subreg.c (subreg_context): New static bitmap.
* lower-subreg.c (subreg_context): New static bitmap. (decompose_multiword_subregs): Allocate and free it. (find_decomposable_subregs): Set a bit in it for a register that occurs in a subreg that changes mode but not size. (can_decompose_p): Test it instead of non_decomposable_context. From-SVN: r162181
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