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

runtime/vm/instructions_arm64.cc

Index: runtime/vm/instructions_arm64.cc
diff --git a/runtime/vm/instructions_arm64.cc b/runtime/vm/instructions_arm64.cc
index 9987527126276f79549da9d6573594c90c416d17..83de46e38bc535ffdca02fc102a8606cdea65f9f 100644
--- a/runtime/vm/instructions_arm64.cc
+++ b/runtime/vm/instructions_arm64.cc
@@ -16,10 +16,8 @@ namespace dart {
 CallPattern::CallPattern(uword pc, const Code& code)
     : object_pool_(ObjectPool::Handle(code.GetObjectPool())),
       end_(pc),
-      args_desc_load_end_(0),
       ic_data_load_end_(0),
       target_address_pool_index_(-1),
-      args_desc_(Array::Handle()),
       ic_data_(ICData::Handle()) {
   ASSERT(code.ContainsInstructionAt(pc));
   // Last instruction: blr ip0.
@@ -239,28 +237,13 @@ void InstructionPattern::EncodeLoadWordFromPoolFixed(uword end,
 RawICData* CallPattern::IcData() {
   if (ic_data_.IsNull()) {
     Register reg;
-    args_desc_load_end_ =
-        InstructionPattern::DecodeLoadObject(ic_data_load_end_,
-                                             object_pool_,
-                                             &reg,
-                                             &ic_data_);
-    ASSERT(reg == R5);
-  }
-  return ic_data_.raw();
-}
-
-
-RawArray* CallPattern::ClosureArgumentsDescriptor() {
-  if (args_desc_.IsNull()) {
-    IcData();  // Loading of the ic_data must be decoded first, if not already.
-    Register reg;
-    InstructionPattern::DecodeLoadObject(args_desc_load_end_,
+    InstructionPattern::DecodeLoadObject(ic_data_load_end_,
                                          object_pool_,
                                          &reg,
-                                         &args_desc_);
-    ASSERT(reg == R4);
+                                         &ic_data_);
+    ASSERT(reg == R5);
   }
-  return args_desc_.raw();
+  return ic_data_.raw();
 }