[RISCV] Set isReMaterializable for ORI, XORI
[RISCV] Set isReMaterializable for ORI, XORI

Reviewers: asb

Reviewed By: asb

Subscribers: asb, rbar, johnrusso, simoncook, sabuasal, niosHD, kito-cheng, shiva0217, zzheng, edward-jones, rogfer01, MartinMosbeck, brucehoult, the_o, rkruppe, PkmX, jocewei

Differential Revision: https://reviews.llvm.org/D57069

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@352008 91177308-0d34-0410-b5e6-96231b3b80d8

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