Thumb2 Backend: Update Code objects with mode, separate Assembler methods for Thumb2

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index e37f6d1b2592a84f11d0fa1b7748b768d185e1c5..27aaad3580d02d2fab08d0dd5d6ed3ff50aa311a 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -10187,7 +10187,7 @@ void Code::CopyFrom(const CodeDesc& desc) {
       // pointers to the first instruction in the code object
       Handle<Object> p = it.rinfo()->target_object_handle(origin);
       Code* code = Code::cast(*p);
-      it.rinfo()->set_target_address(code->instruction_start(),
+      it.rinfo()->set_target_address(code->entry(),
                                      SKIP_WRITE_BARRIER);
     } else if (RelocInfo::IsRuntimeEntry(mode)) {
       Address p = it.rinfo()->target_runtime_entry(origin);