Revert "Attempt to pacify ASan and UBSan reports in CrashRecovery tests"

It's not needed after r303729.

This reverts commit r303311.

llvm-svn: 303783
diff --git a/llvm/unittests/Support/CrashRecoveryTest.cpp b/llvm/unittests/Support/CrashRecoveryTest.cpp
index 33d87a1..dbb0db5 100644
--- a/llvm/unittests/Support/CrashRecoveryTest.cpp
+++ b/llvm/unittests/Support/CrashRecoveryTest.cpp
@@ -17,15 +17,11 @@
 #include <windows.h>
 #endif
 
-extern "C" const char *__asan_default_options() {
-  return "allow_user_segv_handler=1";
-}
-
 using namespace llvm;
 using namespace llvm::sys;
 
 static int GlobalInt = 0;
-static void nullDeref() { *(volatile int *)0x10 = 0; }
+static void nullDeref() { *(volatile int *)nullptr = 0; }
 static void incrementGlobal() { ++GlobalInt; }
 static void llvmTrap() { LLVM_BUILTIN_TRAP; }