[llvm] [SROA]: Only defer trying partial sized ptr or ptr vector types (PR #82279)

[Jeffrey Byrnes via llvm-commits]

jrbyrnes wrote:

There is no good way to capture the actual failure. This is because the failure depends on overwriting the reclaimed memory -- this is dependent upon malloc as well as hardware. 

Instead, I've added an assert which enforces memory invariance to support the test. This is one of the conditions for the failure.

https://github.com/llvm/llvm-project/pull/82279