[llvm] [InstCombine] Propagate invariant.load metadata across unpacked loads (PR #152186)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> This change seems to crash the following testcase. Seems totally unrelated to my change, and it is a llc testcase.
> 
> ```
> -- Testing: 60849 tests, 64 workers --
>   Testing:  0.. 10.. 20.. 30..
>   FAIL: LLVM :: CodeGen/Thumb2/mve-vcvt-fixed-to-float.ll (23899 of 60849)
>   ******************** TEST 'LLVM :: CodeGen/Thumb2/mve-vcvt-fixed-to-float.ll' FAILED ********************
>   Exit Code: 1
> ```

Yeah it was also observed in another PR https://github.com/llvm/llvm-project/pull/152851#issuecomment-3185513710


https://github.com/llvm/llvm-project/pull/152186