Use the BitField class for Code::Flags.

src/stub-cache.h

Index: src/stub-cache.h
diff --git a/src/stub-cache.h b/src/stub-cache.h
index 95577d8c7c708468f8d6cdefcd03baee20cae5c5..f21015a2635235bfd4627862d3a90eecc4659094 100644
--- a/src/stub-cache.h
+++ b/src/stub-cache.h
@@ -382,7 +382,7 @@ class StubCache {
     // We always set the in_loop bit to zero when generating the lookup code
     // so do it here too so the hash codes match.
     uint32_t iflags =
-        (static_cast<uint32_t>(flags) & ~Code::kFlagsICInLoopMask);
+        (static_cast<uint32_t>(flags) & ~Code::ICInLoopField::kMask);
     uint32_t key = seed - string_low32bits + iflags;
     return key & ((kSecondaryTableSize - 1) << kHeapObjectTagSize);
   }