[MachineScheduler] Test case for physical register dependencies

[foad]

Self-approving.

llvm/test/CodeGen/AMDGPU/schedule-physregdeps.mir

+# RUN: llc -march=amdgcn -run-pass machine-scheduler -verify-machineinstrs %s -o - -debug-only=machine-scheduler 2>&1 | FileCheck %s
+# REQUIRES: asserts
+
+# CHECK:     SU(0):   $vgpr0 = V_MOV_B32_e32 $sgpr0, implicit $exec
+# CHECK:       Successors:
+# CHECK-NEXT:    SU(2): Out  Latency=1
+# CHECK-NEXT:    SU(4): Out  Latency=1
+# CHECK-NEXT:    SU(2): Data Latency=1 Reg=$vgpr0
+# CHECK-NEXT:    SU(4): Data Latency=1 Reg=$vgpr0_vgpr1
+# CHECK:     SU(1):   $vgpr1 = V_MOV_B32_e32 $sgpr0, implicit $exec
+# CHECK:       Successors:
+# CHECK-NEXT:    SU(3): Out  Latency=1
+# CHECK-NEXT:    SU(4): Out  Latency=1
+# CHECK-NEXT:    SU(3): Data Latency=1 Reg=$vgpr1
+# CHECK-NEXT:    SU(4): Data Latency=1 Reg=$vgpr0_vgpr1
+# CHECK:     SU(2):   $vgpr0 = V_ADD_CO_U32_e32 $sgpr2, $vgpr0, implicit-def $vcc, implicit $exec
+# CHECK:       Predecessors:
+# CHECK-NEXT:    SU(0): Out  Latency=1
+# CHECK-NEXT:    SU(0): Data Latency=1 Reg=$vgpr0
+# CHECK:       Successors:
+# CHECK-NEXT:    SU(4): Out  Latency=1
+# CHECK-NEXT:    SU(4): Data Latency=1 Reg=$vgpr0_vgpr1
+# CHECK-NEXT:    SU(3): Out  Latency=1
+# CHECK-NEXT:    SU(3): Data Latency=1 Reg=$vcc
+# CHECK-NEXT:    SU(4): Anti Latency=0
+# CHECK:     SU(3):   $vgpr1 = V_ADDC_U32_e32 0, $vgpr1, implicit-def dead $vcc, implicit $vcc, implicit $exec
+# CHECK:       Predecessors:
+# CHECK-NEXT:    SU(2): Out  Latency=1
+# CHECK-NEXT:    SU(2): Data Latency=1 Reg=$vcc
+# CHECK-NEXT:    SU(1): Out  Latency=1
+# CHECK-NEXT:    SU(1): Data Latency=1 Reg=$vgpr1
+# CHECK:       Successors:
+# CHECK-NEXT:    SU(4): Out  Latency=1
+# CHECK-NEXT:    SU(4): Data Latency=1 Reg=$vgpr0_vgpr1
+# CHECK-NEXT:    SU(4): Anti Latency=0
+# CHECK:     SU(4):   $vgpr0_vgpr1 = FLAT_LOAD_DWORDX2 renamable $vgpr0_vgpr1, 0, 0, implicit $exec, implicit $flat_scr
+# CHECK:       Predecessors:
+# CHECK-NEXT:    SU(3): Out  Latency=1
+# CHECK-NEXT:    SU(3): Data Latency=1 Reg=$vgpr0_vgpr1
+# CHECK-NEXT:    SU(3): Anti Latency=0
+# CHECK-NEXT:    SU(2): Out  Latency=1
+# CHECK-NEXT:    SU(2): Data Latency=1 Reg=$vgpr0_vgpr1
+# CHECK-NEXT:    SU(2): Anti Latency=0
+# CHECK-NEXT:    SU(1): Out  Latency=1
+# CHECK-NEXT:    SU(1): Data Latency=1 Reg=$vgpr0_vgpr1
+# CHECK-NEXT:    SU(0): Out  Latency=1
+# CHECK-NEXT:    SU(0): Data Latency=1 Reg=$vgpr0_vgpr1
+# CHECK:       Successors:
+# CHECK-NEXT:    ExitSU: Ord  Latency=3 Artificial
+
+---
+name: test
+tracksRegLiveness: true
+body: |
+  bb.0:
+    liveins: $sgpr0, $sgpr1, $sgpr2
+    $vgpr0 = V_MOV_B32_e32 $sgpr0, implicit $exec
+    $vgpr1 = V_MOV_B32_e32 $sgpr0, implicit $exec
+    $vgpr0 = V_ADD_CO_U32_e32 $sgpr2, $vgpr0, implicit-def $vcc, implicit $exec
+    $vgpr1 = V_ADDC_U32_e32 0, $vgpr1, implicit-def dead $vcc, implicit $vcc, implicit $exec
+    $vgpr0_vgpr1 = FLAT_LOAD_DWORDX2 renamable $vgpr0_vgpr1, 0, 0, implicit $exec, implicit $flat_scr
+...