[libc++abi] Remove redundant null pointer check in operator delete

[MaskRay]

Summary

Similar to D52401. Normally operator delete is defined in libc++abi
(LIBCPP_DISABLE_NEW_DELETE_DEFINITIONS is off by default).

C89 4.10.3.2 The free function
C99 7.20.3.2 The free function
C11 7.22.3.3 The free function

If ptr is a null pointer, no action shall occur.

free on MSDN:

If memblock is NULL, the pointer is ignored and free immediately returns.

libcxxabi/src/stdlib_new_delete.cpp

 #endif  // _LIBCXXABI_NO_EXCEPTIONS
     return p;
 }
 
 _LIBCXXABI_WEAK
 void
 operator delete(void* ptr) _NOEXCEPT
 {
-    if (ptr)
-        ::free(ptr);
 }
 
 _LIBCXXABI_WEAK
 void
 operator delete(void* ptr, const std::nothrow_t&) _NOEXCEPT
 {
     ::operator delete(ptr);
 }