Link function contexts directly to the previous context.

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index 464478a310000dd872229e35edb8de3b106bd2a1..e10e2992ad5736f4d37b2a9b21fabebb9fd027cc 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -2538,12 +2538,9 @@ void MacroAssembler::Abort(const char* msg) {
 void MacroAssembler::LoadContext(Register dst, int context_chain_length) {
   if (context_chain_length > 0) {
     // Move up the chain of contexts to the context containing the slot.
-    ldr(dst, MemOperand(cp, Context::SlotOffset(Context::CLOSURE_INDEX)));
-    // Load the function context (which is the incoming, outer context).
-    ldr(dst, FieldMemOperand(dst, JSFunction::kContextOffset));
+    ldr(dst, MemOperand(cp, Context::SlotOffset(Context::PREVIOUS_INDEX)));
     for (int i = 1; i < context_chain_length; i++) {
-      ldr(dst, MemOperand(dst, Context::SlotOffset(Context::CLOSURE_INDEX)));
-      ldr(dst, FieldMemOperand(dst, JSFunction::kContextOffset));
+      ldr(dst, MemOperand(dst, Context::SlotOffset(Context::PREVIOUS_INDEX)));
     }
   } else {
     // Slot is in the current function context.  Move it into the