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Select vector G_ADD for MIPS32 with MSA. We have to set bank
for vector operands to fprb and selectImpl will do the rest.
__builtin_msa_addv_<format> will be transformed into G_ADD
in legalizeIntrinsic and selected in the same way.
__builtin_msa_addvi_<format> will be directly selected into
ADDVI_<format> in legalizeIntrinsic. MIR tests for it have
unnecessary additional copies. Capture current state of tests
with run-pass=legalizer with a test in test/CodeGen/MIR/Mips.
Differential Revision: https://reviews.llvm.org/D68984
llvm-svn: 375501
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