rustc-15.0.0: [DwarfEhPrepare] Assign dummy debug location for inserted _Unwind_Res…

…ume calls (PR57469)

DwarfEhPrepare inserts calls to _Unwind_Resume into landing pads.
If _Unwind_Resume happens to be defined in the same module and
debug info is used, then this leads to a verifier error:

  inlinable function call in a function with debug info must
    have a !dbg location
  call void @_Unwind_Resume(ptr %exn.obj) #0

Fix this by assigning a dummy location to the call. (As this
happens in the backend, inlining is not actually relevant here.)

Fixes https://github.com/llvm/llvm-project/issues/57469.

Differential Revision: https://reviews.llvm.org/D133095

(cherry picked from commit 5134bd432f8c35c87f4c4dc3bb744d396adcab58)

14.0.5: [AST] Don't assert instruction reads/writes memory (PR51333)

This function is well-defined for an instruction that doesn't access
memory (and thus trivially doesn't alias anything in the AST), so
drop the assert. We can end up with a readnone call here if we
originally created a MemoryDef for an indirect call, which was
later replaced with a direct readnone call.

Fixes https://github.com/llvm/llvm-project/issues/51333.

Differential Revision: https://reviews.llvm.org/D127947

(cherry picked from commit 560e694d48a6020f613281c29ffd17184f56dfb0)

rustc-14.0.5: [AST] Don't assert instruction reads/writes memory (PR51333)

This function is well-defined for an instruction that doesn't access
memory (and thus trivially doesn't alias anything in the AST), so
drop the assert. We can end up with a readnone call here if we
originally created a MemoryDef for an indirect call, which was
later replaced with a direct readnone call.

Fixes https://github.com/llvm/llvm-project/issues/51333.

Differential Revision: https://reviews.llvm.org/D127947

(cherry picked from commit 560e694d48a6020f613281c29ffd17184f56dfb0)