[turbofan] Performance enhancements for escape analysis

src/base/flags.h

Index: src/base/flags.h
diff --git a/src/base/flags.h b/src/base/flags.h
index 4d9e14e5f913fc8a8b8c9bb6fb88ca55b5150896..6bdb69319d5923d60bff101d63f2695500719844 100644
--- a/src/base/flags.h
+++ b/src/base/flags.h
@@ -108,13 +108,17 @@ class Flags final {
       ALLOW_UNUSED_TYPE WARN_UNUSED_RESULT;                                   \
   inline Type operator^(Type::flag_type lhs, Type::flag_type rhs) {           \
     return Type(lhs) ^ rhs;                                                   \
-  } inline Type operator^(Type::flag_type lhs, const Type& rhs)               \
+  } inline Type                                                               \
+  operator^(Type::flag_type lhs, const Type& rhs)                             \
       ALLOW_UNUSED_TYPE WARN_UNUSED_RESULT;                                   \
   inline Type operator^(Type::flag_type lhs, const Type& rhs) {               \
     return rhs ^ lhs;                                                         \
-  } inline void operator^(Type::flag_type lhs, Type::mask_type rhs)           \
-      ALLOW_UNUSED_TYPE;                                                      \
-  inline void operator^(Type::flag_type lhs, Type::mask_type rhs) {}
+  } inline void                                                               \
+  operator^(Type::flag_type lhs, Type::mask_type rhs) ALLOW_UNUSED_TYPE;      \
+  inline void operator^(Type::flag_type lhs, Type::mask_type rhs) {           \
+  } inline Type                                                               \
+  operator~(Type::flag_type val)ALLOW_UNUSED_TYPE;                            \
+  inline Type operator~(Type::flag_type val) { return ~Type(val); }
 
 }  // namespace base
 }  // namespace v8