[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 `clang-s390x-linux-lnt` running on `systemz-1` while building `llvm` at step 7 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/136/builds/6048

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

```
Step 7 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: CodeGen/AMDGPU/local-atomicrmw-fmax.ll' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1200 -mattr=+real-true16 < /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fmax.ll | /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/FileCheck -check-prefixes=GFX12,GFX12-TRUE16 /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fmax.ll
# executed command: /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1200 -mattr=+real-true16
# executed command: /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/FileCheck -check-prefixes=GFX12,GFX12-TRUE16 /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fmax.ll
# RUN: at line 3
/home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1200 -mattr=-real-true16 < /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fmax.ll | /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/FileCheck -check-prefixes=GFX12,GFX12-FAKE16 /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fmax.ll
# executed command: /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1200 -mattr=-real-true16
# executed command: /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/FileCheck -check-prefixes=GFX12,GFX12-FAKE16 /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fmax.ll
# RUN: at line 4
/home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx942 < /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fmax.ll | /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/FileCheck -check-prefix=GFX942 /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fmax.ll
# executed command: /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx942
# executed command: /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/FileCheck -check-prefix=GFX942 /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fmax.ll
# .---command stderr------------
# | /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fmax.ll:6729:16: error: GFX942-NEXT: expected string not found in input
# | ; GFX942-NEXT: ds_read_b32 v3, v0
# |                ^
# | <stdin>:1152:41: note: scanning from here
# |  s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
# |                                         ^
# | <stdin>:1153:2: note: possible intended match here
# |  ds_read_b32 v4, v0
# |  ^
# | /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fmax.ll:7207:16: error: GFX942-NEXT: expected string not found in input
# | ; GFX942-NEXT: ds_read_b32 v3, v0 offset:65532
# |                ^
# | <stdin>:1217:41: note: scanning from here
# |  s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
# |                                         ^
# | <stdin>:1218:2: note: possible intended match here
# |  ds_read_b32 v4, v0 offset:65532
# |  ^
# | 
# | Input file: <stdin>
# | Check file: /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fmax.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |              .
# |              .
# |              .
# |           1147:  .globl local_atomic_fmax_ret_v2bf16 ; -- Begin function local_atomic_fmax_ret_v2bf16 
# |           1148:  .p2align 2 
# |           1149:  .type local_atomic_fmax_ret_v2bf16, at function 
...

```

</details>

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