Revert r342936 "Remove redundant null pointer check in operator delete"

A review for the change was opened in https://reviews.llvm.org/D52401
but the change was committed before being approved by any of the code
owners for libc++.

llvm-svn: 342938

1 files changed, 5 insertions, 3 deletions

diff --git a/libcxx/src/new.cpp b/libcxx/src/new.cpp
index 35f481db08a..8013d89ae3c 100644
--- a/libcxx/src/new.cpp
+++ b/libcxx/src/new.cpp
@@ -135,7 +135,8 @@ _LIBCPP_WEAK
 void
 operator delete(void* ptr) _NOEXCEPT
 {
-    ::free(ptr);
+    if (ptr)
+        ::free(ptr);
 }
 
 _LIBCPP_WEAK
@@ -256,10 +257,11 @@ _LIBCPP_WEAK
 void
 operator delete(void* ptr, std::align_val_t) _NOEXCEPT
 {
+    if (ptr)
 #if defined(_LIBCPP_MSVCRT_LIKE)
-    ::_aligned_free(ptr);
+        ::_aligned_free(ptr);
 #else
-    ::free(ptr);
+        ::free(ptr);
 #endif
 }