GlobalISel selection loses disjoint flag on or

[arsenm]

This test case does not have the disjoint flag on the resulting S_OR_B32:

# RUN: llc -mtriple=amdgcn-- -run-pass=instruction-select -o - %s
---
name:            s_or_i32_disjoint
tracksRegLiveness: true
regBankSelected: true
legalized: true
body:             |
  bb.0:
    liveins: $sgpr0, $sgpr1

    %0:sgpr(s32) = COPY $sgpr0
    %1:sgpr(s32) = COPY $sgpr1
    %2:sgpr(s32) = disjoint G_OR %0, %1
    $sgpr0 = COPY %2
    SI_RETURN_TO_EPILOG implicit $sgpr0

...

[llvmbot]

@llvm/issue-subscribers-backend-amdgpu

Author: Matt Arsenault (arsenm)

This test case does not have the disjoint flag on the resulting S_OR_B32:

# RUN: llc -mtriple=amdgcn-- -run-pass=instruction-select -o - %s
---
name:            s_or_i32_disjoint
tracksRegLiveness: true
regBankSelected: true
legalized: true
body:             |
  bb.0:
    liveins: $sgpr0, $sgpr1

    %0:sgpr(s32) = COPY $sgpr0
    %1:sgpr(s32) = COPY $sgpr1
    %2:sgpr(s32) = disjoint G_OR %0, %1
    $sgpr0 = COPY %2
    SI_RETURN_TO_EPILOG implicit $sgpr0

...