Decode ic data and arguments descriptor passed in calls on ARM.

runtime/vm/code_patcher_arm.cc

Index: runtime/vm/code_patcher_arm.cc
===================================================================
--- runtime/vm/code_patcher_arm.cc	(revision 19826)
+++ runtime/vm/code_patcher_arm.cc	(working copy)
@@ -33,7 +33,8 @@
                                       const Code& code,
                                       uword new_target) {
   ASSERT(code.ContainsInstructionAt(return_address));
-  UNIMPLEMENTED();
+  CallPattern call(return_address, code);
+  call.SetTargetAddress(new_target);
 }
 
 
@@ -47,13 +48,20 @@
                                      ICData* ic_data,
                                      Array* arguments_descriptor) {
   ASSERT(code.ContainsInstructionAt(return_address));
-  UNIMPLEMENTED();
-  return 0;
+  CallPattern call(return_address, code);
+  if (ic_data != NULL) {
+    *ic_data = call.IcData();
+  }
+  if (arguments_descriptor != NULL) {
+    *arguments_descriptor = call.ArgumentsDescriptor();
+  }
+  return call.TargetAddress();
 }
 
 
 intptr_t CodePatcher::InstanceCallSizeInBytes() {
-  UNIMPLEMENTED();
+  // The instance call instruction sequence has a variable size on ARM.
+  UNREACHABLE();
   return 0;
 }