Disable CFI on a few methods.

src/base/macros.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_BASE_MACROS_H_
 #define V8_BASE_MACROS_H_
 
 #include "src/base/compiler-specific.h"
 #include "src/base/format-macros.h"
 #include "src/base/logging.h"
@@ skipping 136 matching lines @@
 #endif
 #endif
 
 // Define DISABLE_ASAN macros.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #define DISABLE_ASAN __attribute__((no_sanitize_address))
 #else
 #define DISABLE_ASAN
 #endif
 
+// DISABLE_CFI_PERF -- Disable Control Flow Integrity checks for Perf reasons.
+#if !defined(DISABLE_CFI_PERF)
+#if defined(__clang__) && defined(__has_attribute)
+#if __has_attribute(no_sanitize)
+#define DISABLE_CFI_PERF __attribute__((no_sanitize("cfi")))
+#endif
+#endif
+#endif
+#if !defined(DISABLE_CFI_PERF)
+#define DISABLE_CFI_PERF
+#endif
 
 #if V8_CC_GNU
 #define V8_IMMEDIATE_CRASH() __builtin_trap()
 #else
 #define V8_IMMEDIATE_CRASH() ((void(*)())0)()
 #endif
 
 
 // TODO(all) Replace all uses of this macro with static_assert, remove macro.
 #define STATIC_ASSERT(test) static_assert(test, #test)
@@ skipping 123 matching lines @@
 
 template <>
 inline bool is_fundamental<uint8_t>() {
   return true;
 }
 
 }  // namespace base
 }  // namespace v8
 
 #endif   // V8_BASE_MACROS_H_