[clang] [clang] Implement constexpr heap allocation alignments (PR #174549)

[Aaron Ballman via cfe-commits]

================
@@ -540,6 +540,9 @@ features cannot lower the translation-unit ABI level;
   reference to a vector type; `vec_step` (in C++ for OpenCL) and
   `__builtin_ptrauth_type_discriminator` similarly no longer accept reference
   types that their evaluation silently mishandled. (#GH216997)
+- Fix a crash when using ``__builtin_assume_aligned`` with dynamic allocations during
----------------
AaronBallman wrote:

```suggestion
- Fix a crash when using `__builtin_assume_aligned` with dynamic allocations during
```

https://github.com/llvm/llvm-project/pull/174549