[llvm] InstCombine: Fix wrong insert point for sqrt -> copysign simplify (PR #180838)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `intel-sycl-gpu` running on `intel-sycl-gpu-01` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/225/builds/2483

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

```
Step 6 (test-build-unified-tree-check-all) failure: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
...
PASS: libomp :: worksharing/for/omp_for_collapse.c (94813 of 94823)
PASS: libomp :: env/kmp_set_dispatch_buf.c (94814 of 94823)
PASS: libomp :: worksharing/single/omp_single.c (94815 of 94823)
XFAIL: LLVM :: CodeGen/SPIRV/extensions/SPV_INTEL_long_composites/long-spec-const-composite.ll (94816 of 94823)
PASS: libomp :: tasking/issue-69733.c (94817 of 94823)
PASS: libomp :: worksharing/for/omp_collapse_many_GTGEGT_int.c (94818 of 94823)
PASS: libomp :: worksharing/for/omp_collapse_many_GELTGT_int.c (94819 of 94823)
PASS: libomp :: tasking/issue-94260-1.cpp (94820 of 94823)
PASS: libomp :: tasking/issue-94260-2.c (94821 of 94823)
PASS: libomp :: worksharing/for/omp_collapse_many_LTLEGE_int.c (94822 of 94823)
command timed out: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1513.102273

```

</details>

https://github.com/llvm/llvm-project/pull/180838