Revert of Thread maybe-assigned through the bytecodes.

src/compiler/bytecode-graph-builder.cc

Index: src/compiler/bytecode-graph-builder.cc
diff --git a/src/compiler/bytecode-graph-builder.cc b/src/compiler/bytecode-graph-builder.cc
index 4b2abad3dd3d23c579541519cb08314355494451..d9f52a61b76ad03a381b3fbab4645ef6013da33c 100644
--- a/src/compiler/bytecode-graph-builder.cc
+++ b/src/compiler/bytecode-graph-builder.cc
@@ -770,6 +770,9 @@
 }
 
 void BytecodeGraphBuilder::VisitLdaContextSlot() {
+  // TODO(mythria): immutable flag is also set to false. This information is not
+  // available in bytecode array. update this code when the implementation
+  // changes.
   const Operator* op = javascript()->LoadContext(
       bytecode_iterator().GetUnsignedImmediateOperand(2),
       bytecode_iterator().GetIndexOperand(1), false);
@@ -780,27 +783,12 @@
   environment()->BindAccumulator(node);
 }
 
-void BytecodeGraphBuilder::VisitLdaImmutableContextSlot() {
-  const Operator* op = javascript()->LoadContext(
-      bytecode_iterator().GetUnsignedImmediateOperand(2),
-      bytecode_iterator().GetIndexOperand(1), true);
-  Node* node = NewNode(op);
-  Node* context =
-      environment()->LookupRegister(bytecode_iterator().GetRegisterOperand(0));
-  NodeProperties::ReplaceContextInput(node, context);
-  environment()->BindAccumulator(node);
-}
-
 void BytecodeGraphBuilder::VisitLdaCurrentContextSlot() {
+  // TODO(mythria): immutable flag is also set to false. This information is not
+  // available in bytecode array. update this code when the implementation
+  // changes.
   const Operator* op = javascript()->LoadContext(
       0, bytecode_iterator().GetIndexOperand(0), false);
-  Node* node = NewNode(op);
-  environment()->BindAccumulator(node);
-}
-
-void BytecodeGraphBuilder::VisitLdaImmutableCurrentContextSlot() {
-  const Operator* op = javascript()->LoadContext(
-      0, bytecode_iterator().GetIndexOperand(0), true);
   Node* node = NewNode(op);
   environment()->BindAccumulator(node);
 }