[PATCH] ARM/NEON: Improve codegen for long sext/zext operations.

[Pete Couperus]

Hello,

The ARM backend currently has poor codegen for long sext/zext
operations, such as v8i8 -> v8i32.
This patch addresses this by performing a custom expansion in ARMISelLowering.
This partially addresses PR14867 (http://llvm.org/bugs/show_bug.cgi?id=14867).
Please review!
Thanks,

Pete
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