Petar Avramovic 98f72a5107 [MIPS GlobalISel] Select bitreverse. Recommit
G_BITREVERSE is generated from llvm.bitreverse.<type> intrinsics,
clang genrates these intrinsics from __builtin_bitreverse32 and
__builtin_bitreverse64.
Add lower and narrowscalar for G_BITREVERSE.
Lower G_BITREVERSE on MIPS32.

Recommit notes:
Introduce temporary variables in order to make sure
instructions get inserted into MachineFunction in same order
regardless of compiler used to build llvm.

Differential Revision: https://reviews.llvm.org/D71363
2019-12-30 18:06:29 +01:00
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