Store arguments descriptor in ICData. Remove loading of arguments descriptor at unoptimized call si…

runtime/vm/raw_object.h

Index: runtime/vm/raw_object.h
===================================================================
--- runtime/vm/raw_object.h	(revision 24207)
+++ runtime/vm/raw_object.h	(working copy)
@@ -1022,16 +1022,17 @@
   RawObject** from() {
     return reinterpret_cast<RawObject**>(&ptr()->function_);
   }
-  RawFunction* function_;     // Parent/calling function of this IC.
-  RawString* target_name_;    // Name of target function.
-  RawArray* ic_data_;         // Contains test class-ids and target functions.
+  RawFunction* function_;      // Parent/calling function of this IC.
+  RawString* target_name_;     // Name of target function.
+  RawArray* args_descriptor_;  // Arguments descriptor.
+  RawArray* ic_data_;          // Contains test class-ids and target functions.
   RawObject** to() {
     return reinterpret_cast<RawObject**>(&ptr()->ic_data_);
   }
-  intptr_t deopt_id_;         // Deoptimization id corresponding to this IC.
-  intptr_t num_args_tested_;  // Number of arguments tested in IC.
-  uint8_t deopt_reason_;      // Last deoptimization reason.
-  uint8_t is_closure_call_;   // 0 or 1.
+  intptr_t deopt_id_;          // Deoptimization id corresponding to this IC.
+  intptr_t num_args_tested_;   // Number of arguments tested in IC.
+  uint8_t deopt_reason_;       // Last deoptimization reason.
+  uint8_t is_closure_call_;    // 0 or 1.
 };