[libc][new] Add placement new functions

[PiJoules]

No description provided.

[llvmbot]

@llvm/pr-subscribers-libc

Author: None (PiJoules)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/94290.diff

1 Files Affected:

• (modified) libc/src/__support/CPP/new.h (+4)

diff --git a/libc/src/__support/CPP/new.h b/libc/src/__support/CPP/new.h
index 6261dc1ffde6f..72187b70d7d24 100644
--- a/libc/src/__support/CPP/new.h
+++ b/libc/src/__support/CPP/new.h
@@ -74,6 +74,10 @@ LIBC_INLINE void *operator new[](size_t size, std::align_val_t align,
   return LIBC_NAMESPACE::AllocChecker::aligned_alloc(size, align, ac);
 }
 
+LIBC_INLINE void *operator new(size_t, void *p) { return p; }
+
+LIBC_INLINE void *operator new[](size_t, void *p) { return p; }
+
 // The ideal situation would be to define the various flavors of operator delete
 // inlinelike we do with operator new above. However, since we need operator
 // delete prototypes to match those specified by the C++ standard, we cannot

[SchrodingerZhu]

LGTM.