Enable test for 64-bit Windows as well

(Reported to work in
#156211 (comment))

Author: thurstond

compiler-rt/test/asan/TestCases/Windows/heaprealloc_alloc_zero.cpp

@@ -1,6 +1,5 @@
 // RUN: %clang_cl_asan %Od %MT -o %t %s
 // RUN: %env_asan_opts=windows_hook_rtl_allocators=true %run %t 2>&1 | FileCheck %s
-// UNSUPPORTED: asan-64-bits
 #include <cassert>
 #include <iostream>
 #include <sanitizer/allocator_interface.h>