[llvm] [RegAlloc] Fix the terminal rule check for interfere with DstReg (PR #168661)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `reverse-iteration` running on `hexagon-build-02` while building `llvm` at step 6 "check_all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/110/builds/6452

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (check_all) failure: test (failure)
******************** TEST 'LLVM :: CodeGen/AMDGPU/local-atomicrmw-fsub.ll' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.obj/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1200 -mattr=+real-true16 < /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.src/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fsub.ll | /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.obj/bin/FileCheck -check-prefixes=GFX12,GFX12-TRUE16 /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.src/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fsub.ll
# executed command: /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.obj/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1200 -mattr=+real-true16
# executed command: /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.obj/bin/FileCheck -check-prefixes=GFX12,GFX12-TRUE16 /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.src/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fsub.ll
# RUN: at line 3
/local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.obj/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1200 -mattr=-real-true16 < /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.src/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fsub.ll | /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.obj/bin/FileCheck -check-prefixes=GFX12,GFX12-FAKE16 /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.src/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fsub.ll
# executed command: /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.obj/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1200 -mattr=-real-true16
# executed command: /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.obj/bin/FileCheck -check-prefixes=GFX12,GFX12-FAKE16 /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.src/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fsub.ll
# RUN: at line 4
/local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.obj/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx942 < /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.src/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fsub.ll | /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.obj/bin/FileCheck -check-prefix=GFX942 /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.src/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fsub.ll
# executed command: /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.obj/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx942
# executed command: /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.obj/bin/FileCheck -check-prefix=GFX942 /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.src/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fsub.ll
# .---command stderr------------
# | /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.src/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fsub.ll:7497:16: error: GFX942-NEXT: expected string not found in input
# | ; GFX942-NEXT: ds_read_b32 v3, v0
# |                ^
# | <stdin>:1234:41: note: scanning from here
# |  s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
# |                                         ^
# | <stdin>:1235:2: note: possible intended match here
# |  ds_read_b32 v4, v0
# |  ^
# | /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.src/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fsub.ll:7975:16: error: GFX942-NEXT: expected string not found in input
# | ; GFX942-NEXT: ds_read_b32 v3, v0 offset:65532
# |                ^
# | <stdin>:1299:41: note: scanning from here
# |  s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
# |                                         ^
# | <stdin>:1300:2: note: possible intended match here
# |  ds_read_b32 v4, v0 offset:65532
# |  ^
# | 
# | Input file: <stdin>
# | Check file: /local/mnt/workspace/bots/hexagon-build-02/reverse-iteration/llvm.src/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fsub.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |              .
# |              .
# |              .
# |           1229:  .globl local_atomic_fsub_ret_v2bf16 ; -- Begin function local_atomic_fsub_ret_v2bf16 
# |           1230:  .p2align 2 
# |           1231:  .type local_atomic_fsub_ret_v2bf16, at function 
...

```

</details>

https://github.com/llvm/llvm-project/pull/168661