VM: Remove dead code from arm/mips/arm64 call instruction patterns

runtime/vm/instructions_arm.h

Index: runtime/vm/instructions_arm.h
diff --git a/runtime/vm/instructions_arm.h b/runtime/vm/instructions_arm.h
index 4d708ca33b010c943e08c991401243c6638821c8..5b10151c5b49b7e98f860fbfb4925c1a6d46c4e6 100644
--- a/runtime/vm/instructions_arm.h
+++ b/runtime/vm/instructions_arm.h
@@ -52,7 +52,6 @@ class CallPattern : public ValueObject {
   CallPattern(uword pc, const Code& code);
 
   RawICData* IcData();
-  RawArray* ClosureArgumentsDescriptor();
 
   uword TargetAddress() const;
   void SetTargetAddress(uword target_address) const;
@@ -67,11 +66,9 @@ class CallPattern : public ValueObject {
   const ObjectPool& object_pool_;
 
   uword end_;
-  uword args_desc_load_end_;
   uword ic_data_load_end_;
 
   intptr_t target_address_pool_index_;
-  Array& args_desc_;
   ICData& ic_data_;
 
   DISALLOW_COPY_AND_ASSIGN(CallPattern);