[llvm] [InstCombine] Fix a cycle when folding fneg(select) with scalable vector types (PR #112465)

[via llvm-commits]

ssijaric-nv wrote:

Thank you, all.  Can someone please merge this change, as I don't have write access.  I'll rebase and push again, to get a clean build before merging.

I ran the test-suite locally with -O3 on AArch64 and x86 machines:

AArch64:
Total Discovered Tests: 3425
  Passed: 3425 (100.00%)

With -mcpu=neoverse-v2
Total Discovered Tests: 3425
  Passed: 3425 (100.00%)

x86:
Total Discovered Tests: 2441
  Passed: 2441 (100.00%)

ninja check-llvm passed as well.

https://github.com/llvm/llvm-project/pull/112465