[ic] Cleanup stub cache.

BUG=

Review-Url: https://codereview.chromium.org/2710513003
Cr-Commit-Position: refs/heads/master@{#43329}

src/ic/stub-cache.cc

@@ -100,12 +100,12 @@ void StubCache::Clear() {
   Code* empty = isolate_->builtins()->builtin(Builtins::kIllegal);
   for (int i = 0; i < kPrimaryTableSize; i++) {
     primary_[i].key = isolate()->heap()->empty_string();
-    primary_[i].map = NULL;
+    primary_[i].map = nullptr;
     primary_[i].value = empty;
   }
   for (int j = 0; j < kSecondaryTableSize; j++) {
     secondary_[j].key = isolate()->heap()->empty_string();
-    secondary_[j].map = NULL;
+    secondary_[j].map = nullptr;
     secondary_[j].value = empty;
   }
 }
@@ -117,9 +117,9 @@ void StubCache::CollectMatchingMaps(SmallMapList* types, Handle<Name> name,
   for (int i = 0; i < kPrimaryTableSize; i++) {
     if (primary_[i].key == *name) {
       Map* map = primary_[i].map;
-      // Map can be NULL, if the stub is constant function call
+      // Map can be nullptr, if the stub is constant function call
       // with a primitive receiver.
-      if (map == NULL) continue;
+      if (map == nullptr) continue;
 
       int offset = PrimaryOffset(*name, map);
       if (entry(primary_, offset) == &primary_[i] &&
@@ -132,9 +132,9 @@ void StubCache::CollectMatchingMaps(SmallMapList* types, Handle<Name> name,
   for (int i = 0; i < kSecondaryTableSize; i++) {
     if (secondary_[i].key == *name) {
       Map* map = secondary_[i].map;
-      // Map can be NULL, if the stub is constant function call
+      // Map can be nullptr, if the stub is constant function call
       // with a primitive receiver.
-      if (map == NULL) continue;
+      if (map == nullptr) continue;
 
       // Lookup in primary table and skip duplicates.
       int primary_offset = PrimaryOffset(*name, map);

src/ic/stub-cache.h

@@ -74,7 +74,7 @@ class StubCache {
         return StubCache::secondary_;
     }
     UNREACHABLE();
-    return NULL;
+    return nullptr;
   }
 
   Isolate* isolate() { return isolate_; }
@@ -92,7 +92,7 @@ class StubCache {
 
   // Some magic number used in primary and secondary hash computations.
   static const int kPrimaryMagic = 0x3d532433;
-  static const int kSecondaryMagic = 0xb16b00b5;
+  static const int kSecondaryMagic = 0xb16ca6e5;
 
   static int PrimaryOffsetForTesting(Name* name, Map* map) {
     return PrimaryOffset(name, map);