llvm-project

17092bd3 - [SystemZ] XPLINK64: use AExt for 32-bit pointer formals (#222350)

[SystemZ] XPLINK64: use AExt for 32-bit pointer formals (#222350) CC_XPLINK64_Pointer was setting LocInfo=ZExt, promising the optimizer that the caller had zero-extended bit 32. Evidence from Open XL 1.1 and 2.2 shows that callers do not consistently zero-extend `__ptr32` arguments -- Open XL 1.1 emits nothing on the caller side; Open XL 2.2 only zero-extends in the explicit cast case. Every actual use of a 31-bit pointer goes through `addrspacecast` which emits `LLGTR` to clear bit 32 at the point of use, so no callee relies on the register being clean at the parameter boundary. Change LocInfo to AExt to accurately reflect that only the low 32 bits are valid. Extracted from #206833 per reviewer request.