[PATCH] Add support bswap16 to/from memory compiling to rev16 on ARM/Thumb

[Louis Gerbarg]

Currently most __builtin_bswap16() intrinsics from the frontend end up generating sup-optimal code due to legalization promoting some of the operands to i32s during load/stores. That results in the backend generating a rev and an lsr instead of a rev16. This patch adds patterns that catch those situations and generate a rev16.

Louis

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