[llvm-bugs] [Bug 51629] New: inconsistent alignment passed for array allocation and deallocation when alignof(cookie) > alignof(T)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51629

            Bug ID: 51629
           Summary: inconsistent alignment passed for array allocation and
                    deallocation when alignof(cookie) > alignof(T)
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Testcase:

```
struct X { ~X(); int c; };
extern int n;
X *p = new X[n];
void f() { delete [] p; }
```

On x86_64, under `-faligned-new=2`, this passes `align_val_t{8}` to `operator
new[]` but passes `align_val_t{4}` to `operator delete[]`.

Presumably we should consistently either always or never take the array
cookie's alignment into account when synthesizing the `align_val_t` argument;
always taking it into account seems like the better choice.

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