Crash on Warp-arm64 for int64 wave active sum test

Nobody has claimed this yet.

Running the waveactivesum test for int64 on warp and arm64 specifically will cause what seems to be an AV. There is no helpful output as to what caused a crash, though I believe the 0xc0000005 exit code is commonly seen with AVs.
The output is below:

```
******************** TEST 'OffloadTest-warp-d3d12 :: WaveOps/WaveActiveSum.int64.test' FAILED ********************
Exit Code: 3221225477

Command Output (stdout):
--
# RUN: at line 331
c:\users\github\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\bin\split-file.exe C:\Users\github\actions-runner\_work\offload-test-suite\offload-test-suite\OffloadTest\test\WaveOps\WaveActiveSum.int64.test C:\Users\github\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\warp-d3d12\WaveOps\Output\WaveActiveSum.int64.test.tmp
# executed command: 'c:\users\github\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\bin\split-file.exe' 'C:\Users\github\actions-runner\_work\offload-test-suite\offload-test-suite\OffloadTest\test\WaveOps\WaveActiveSum.int64.test' 'C:\Users\github\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\warp-d3d12\WaveOps\Output\WaveActiveSum.int64.test.tmp'
# RUN: at line 332
"C:\Users\github\actions-runner\_work\offload-test-suite\offload-test-suite\DXC\build\bin\dxc.exe" -T cs_6_5 -Fo C:\Users\github\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\warp-d3d12\WaveOps\Output\WaveActiveSum.int64.test.tmp.o C:\Users\github\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\warp-d3d12\WaveOps\Output\WaveActiveSum.int64.test.tmp/source.hlsl
# executed command: 'C:\Users\github\actions-runner\_work\offload-test-suite\offload-test-suite\DXC\build\bin\dxc.exe' -T cs_6_5 -Fo 'C:\Users\github\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\warp-d3d12\WaveOps\Output\WaveActiveSum.int64.test.tmp.o' 'C:\Users\github\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\warp-d3d12\WaveOps\Output\WaveActiveSum.int64.test.tmp/source.hlsl'
# RUN: at line 333 has no command after substitutions
# RUN: at line 334
c:\users\github\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\bin\offloader.exe -warp C:\Users\github\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\warp-d3d12\WaveOps\Output\WaveActiveSum.int64.test.tmp/pipeline.yaml C:\Users\github\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\warp-d3d12\WaveOps\Output\WaveActiveSum.int64.test.tmp.o
# executed command: 'c:\users\github\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\bin\offloader.exe' -warp 'C:\Users\github\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\warp-d3d12\WaveOps\Output\WaveActiveSum.int64.test.tmp/pipeline.yaml' 'C:\Users\github\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\warp-d3d12\WaveOps\Output\WaveActiveSum.int64.test.tmp.o'
# note: command had no output on stdout or stderr
# error: command failed with exit status: 0xc0000005

--

********************
```

Reproduce the failure from OffloadTest/test/WaveOps/WaveActiveSum.int64.test on warp-d3d12 and arm64. Start with the test commands invoking dxc.exe and offloader.exe -warp, then inspect the crash with the available output or debugging tools. Done means the int64 wave active sum test no longer crashes and reports an appropriate result.

Written by the indexing model from the issue text.