[llvm] [AMDGPU][MIR] Serialize NumPhysicalVGPRSpillLanes (PR #115291)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-x86_64-debian-dylib` running on `gribozavr4` while building `llvm` at step 7 "test-build-unified-tree-check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/60/builds/12116

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

```
Step 7 (test-build-unified-tree-check-llvm) failure: test (failure)
******************** TEST 'LLVM :: CodeGen/MIR/AMDGPU/machine-function-info-long-branch-reg-debug.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 1: /b/1/llvm-x86_64-debian-dylib/build/bin/llc -mtriple=amdgcn-amd-amdhsa -verify-machineinstrs -amdgpu-s-branch-bits=4 -stop-after=branch-relaxation -verify-machineinstrs /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/MIR/AMDGPU/machine-function-info-long-branch-reg-debug.ll -o - | /b/1/llvm-x86_64-debian-dylib/build/bin/FileCheck /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/MIR/AMDGPU/machine-function-info-long-branch-reg-debug.ll
+ /b/1/llvm-x86_64-debian-dylib/build/bin/llc -mtriple=amdgcn-amd-amdhsa -verify-machineinstrs -amdgpu-s-branch-bits=4 -stop-after=branch-relaxation -verify-machineinstrs /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/MIR/AMDGPU/machine-function-info-long-branch-reg-debug.ll -o -
+ /b/1/llvm-x86_64-debian-dylib/build/bin/FileCheck /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/MIR/AMDGPU/machine-function-info-long-branch-reg-debug.ll
/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/MIR/AMDGPU/machine-function-info-long-branch-reg-debug.ll:42:15: error: CHECK-NEXT: is not on the line after the previous match
; CHECK-NEXT: vgprForAGPRCopy: ''
              ^
<stdin>:176:2: note: 'next' match was here
 vgprForAGPRCopy: ''
 ^
<stdin>:174:14: note: previous match ended here
 occupancy: 8
             ^
<stdin>:175:1: note: non-matching line after previous match is here
 numPhysicalVGPRSpillLanes: 0
^

Input file: <stdin>
Check file: /b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/test/CodeGen/MIR/AMDGPU/machine-function-info-long-branch-reg-debug.ll

-dump-input=help explains the following input dump.

Input was:
<<<<<<
         .
         .
         .
       171:  fp64-fp16-input-denormals: true 
       172:  fp64-fp16-output-denormals: true 
       173:  highBitsOf32BitAddress: 0 
       174:  occupancy: 8 
       175:  numPhysicalVGPRSpillLanes: 0 
       176:  vgprForAGPRCopy: '' 
next:42      !~~~~~~~~~~~~~~~~~~  error: match on wrong line
       177:  sgprForEXECCopy: '$sgpr100_sgpr101' 
       178:  longBranchReservedReg: '$sgpr2_sgpr3' 
       179:  hasInitWholeWave: false 
       180: body: | 
       181:  bb.0.bb0: 
         .
         .
         .
>>>>>>

--

...

```

</details>

https://github.com/llvm/llvm-project/pull/115291