[turbofan] Materialize all from non-writable roots from root array.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1175113005

Cr-Commit-Position: refs/heads/master@{#28942}

src/compiler/code-generator.cc

@@ -221,7 +221,16 @@ bool CodeGenerator::IsMaterializableFromFrame(Handle<HeapObject> object,
 bool CodeGenerator::IsMaterializableFromRoot(
     Handle<HeapObject> object, Heap::RootListIndex* index_return) {
   if (linkage()->GetIncomingDescriptor()->IsJSFunctionCall()) {
-    return isolate()->heap()->GetRootListIndex(object, index_return);
+    // Check if {object} is one of the non-smi roots that cannot be written
+    // after initialization.
+    for (int i = 0; i < Heap::kSmiRootsStart; ++i) {
+      Heap::RootListIndex const index = static_cast<Heap::RootListIndex>(i);
+      if (!Heap::RootCanBeWrittenAfterInitialization(index) &&
+          *object == isolate()->heap()->root(index)) {
+        *index_return = index;
+        return true;
+      }
+    }
   }
   return false;
 }

src/heap/heap.cc

@@ -4920,20 +4920,6 @@ bool Heap::RootIsImmortalImmovable(int root_index) {
 }
 
 
-bool Heap::GetRootListIndex(Handle<HeapObject> object,
-                            Heap::RootListIndex* index_return) {
-  Object* ptr = *object;
-#define IMMORTAL_IMMOVABLE_ROOT(Name)            \
-  if (ptr == roots_[Heap::k##Name##RootIndex]) { \
-    *index_return = k##Name##RootIndex;          \
-    return true;                                 \
-  }
-  IMMORTAL_IMMOVABLE_ROOT_LIST(IMMORTAL_IMMOVABLE_ROOT)
-#undef IMMORTAL_IMMOVABLE_ROOT
-  return false;
-}
-
-
 #ifdef VERIFY_HEAP
 void Heap::Verify() {
   CHECK(HasBeenSetUp());

src/heap/heap.h

@@ -1211,10 +1211,6 @@ class Heap {
     kSmiRootsStart = kStringTableRootIndex + 1
   };
 
-  // Get the root list index for {object} if such a root list index exists.
-  bool GetRootListIndex(Handle<HeapObject> object,
-                        Heap::RootListIndex* index_return);
-
   Object* root(RootListIndex index) { return roots_[index]; }
 
   STATIC_ASSERT(kUndefinedValueRootIndex ==