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r213378 improved f16 bitcasts, so that they go directly through subregs, instead of through the stack. That code now causes an assertion failure for bitcasts from other 16-bits types (most importantly v2i8). Correct that by doing the custom lowering for i16 bitcasts only when the input is an f16. Part of PR21549. Differential Revision: http://reviews.llvm.org/D6307 llvm-svn: 223074
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