[MemCpyOpt] Use `dyn_cast` to fix assertion failure in `processMemCpyMemCpyDependence` (#98686)

Fixes https://github.com/llvm/llvm-project/issues/98675.

[MemCpyOpt] Forward `memcpy` based on the actual copy memory location. (#87190)

Fixes #85560.

We can forward `memcpy` as long as the actual memory location being
copied have not been altered.

[MemCpyOpt] Forward `memcpy` based on the actual copy memory location. (#87190)

Fixes #85560.

We can forward `memcpy` as long as the actual memory location being
copied have not been altered.

alive2: https://alive2.llvm.org/ce/z/q9JaHV

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