Missing workaround for old glibc `__PTR_ALIGN` macro

[dtcxzyw]

See also #130742 (comment).

Do not set inbounds flag on GEPs for the following pattern:

((sizeof(long int) < sizeof(void *) ? (base) : (char *)0) +
   (((pointer) - (sizeof(long int) < sizeof(void *) ? (base) : (char *)0) +
     (align_mask)) &
    ~(align_mask)));

1. Handle the pointer addition case (char *0) + idx
2. Handle expr ((sizeof(long int) < sizeof(void *) ? (base) : (char *)0) in isUnderlyingBasePointerConstantNull.

[llvmbot]

@llvm/issue-subscribers-clang-codegen

Author: Yingwei Zheng (dtcxzyw)

See also https://github.com//pull/130742#issuecomment-2835528395.

Do not set inbounds flag on GEPs for the following pattern:

((sizeof(long int) < sizeof(void *) ? (base) : (char *)0) +
   (((pointer) - (sizeof(long int) < sizeof(void *) ? (base) : (char *)0) +
     (align_mask)) &
    ~(align_mask)));

1. Handle the pointer addition case (char *0) + idx
2. Handle expr ((sizeof(long int) < sizeof(void *) ? (base) : (char *)0) in isUnderlyingBasePointerConstantNull.

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Yingwei Zheng (dtcxzyw)

See also https://github.com//pull/130742#issuecomment-2835528395.

Do not set inbounds flag on GEPs for the following pattern:

((sizeof(long int) < sizeof(void *) ? (base) : (char *)0) +
   (((pointer) - (sizeof(long int) < sizeof(void *) ? (base) : (char *)0) +
     (align_mask)) &
    ~(align_mask)));

1. Handle the pointer addition case (char *0) + idx
2. Handle expr ((sizeof(long int) < sizeof(void *) ? (base) : (char *)0) in isUnderlyingBasePointerConstantNull.