Remove functions_cache_ and it's references as it is not being used anymore.

vm/stub_code_x64.cc

Index: vm/stub_code_x64.cc
===================================================================
--- vm/stub_code_x64.cc	(revision 10541)
+++ vm/stub_code_x64.cc	(working copy)
@@ -247,91 +247,6 @@
 }
 
 
-// Lookup for [function-name, arg count] in 'functions_map_'.
-// Input parameters (to be treated as read only, unless calling to target!):
-//   RBX: ic-data.
-//   R10: arguments descriptor array (num_args is first Smi element).
-//   Stack: return address, arguments.
-// If the lookup succeeds we jump to the target method from here, otherwise
-// we continue in code generated by the caller of 'MegamorphicLookup'.
-static void MegamorphicLookup(Assembler* assembler) {
-  const Immediate raw_null =
-      Immediate(reinterpret_cast<intptr_t>(Object::null()));
-  Label class_in_rax, smi_receiver, null_receiver, not_found;
-  // Total number of args is the first Smi in args descriptor array (R10).
-  __ movq(RAX, FieldAddress(R10, Array::data_offset()));
-  __ movq(RAX, Address(RSP, RAX, TIMES_4, 0));  // Get receiver. RAX is a Smi.
-  // TODO(srdjan): Remove the special casing below for null receiver, once
-  // NullClass is implemented.
-  __ cmpq(RAX, raw_null);
-  // Use Object class if receiver is null.
-  __ j(EQUAL, &null_receiver, Assembler::kNearJump);
-  __ testq(RAX, Immediate(kSmiTagMask));
-  __ j(ZERO, &smi_receiver, Assembler::kNearJump);
-  __ LoadClass(RAX, RAX);
-  __ jmp(&class_in_rax, Assembler::kNearJump);
-  __ Bind(&smi_receiver);
-  // For Smis we need to get the class from the isolate.
-  // Load current Isolate pointer from Context structure into RAX.
-  __ movq(RAX, FieldAddress(CTX, Context::isolate_offset()));
-  __ movq(RAX, Address(RAX, Isolate::object_store_offset()));
-  __ movq(RAX, Address(RAX, ObjectStore::smi_class_offset()));
-  __ jmp(&class_in_rax, Assembler::kNearJump);
-  __ Bind(&null_receiver);
-  __ movq(RAX, FieldAddress(CTX, Context::isolate_offset()));
-  __ movq(RAX, Address(RAX, Isolate::object_store_offset()));
-  __ movq(RAX, Address(RAX, ObjectStore::object_class_offset()));
-
-  __ Bind(&class_in_rax);
-  // Class is in RAX.
-
-  Label loop, next_iteration;
-  // Get functions_cache, since it is allocated lazily it maybe null.
-  __ movq(RAX, FieldAddress(RAX, Class::functions_cache_offset()));
-  __ cmpq(RAX, raw_null);
-  __ j(EQUAL, &not_found, Assembler::kNearJump);
-
-  // Iterate and search for identical name.
-  __ leaq(R12, FieldAddress(RAX, Array::data_offset()));
-
-  // R12 is  pointing into content of functions_map_ array.
-  __ Bind(&loop);
-  __ movq(R13, Address(R12, FunctionsCache::kFunctionName * kWordSize));
-
-  __ cmpq(R13, raw_null);
-  __ j(EQUAL, &not_found, Assembler::kNearJump);
-
-  __ cmpq(R13, FieldAddress(RBX, ICData::target_name_offset()));
-  __ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
-
-  // Name found, check total argument count and named argument count.
-  __ movq(RAX, FieldAddress(R10, Array::data_offset()));
-  // RAX is total argument count as Smi.
-  __ movq(R13, Address(R12, FunctionsCache::kArgCount * kWordSize));
-  __ cmpq(RAX, R13);  // Compare total argument counts.
-  __ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
-  __ subq(RAX, FieldAddress(R10, Array::data_offset() + kWordSize));
-  // RAX is named argument count as Smi.
-  __ movq(R13, Address(R12, FunctionsCache::kNamedArgCount * kWordSize));
-  __ cmpq(RAX, R13);  // Compare named argument counts.
-  __ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
-
-  // Argument count matches, jump to target.
-  // R10: arguments descriptor array.
-  __ movq(RBX, Address(R12, FunctionsCache::kFunction * kWordSize));
-  __ movq(RBX, FieldAddress(RBX, Function::code_offset()));
-  __ movq(RBX, FieldAddress(RBX, Code::instructions_offset()));
-  __ addq(RBX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
-  __ jmp(RBX);
-
-  __ Bind(&next_iteration);
-  __ AddImmediate(R12, Immediate(FunctionsCache::kNumEntries * kWordSize));
-  __ jmp(&loop, Assembler::kNearJump);
-
-  __ Bind(&not_found);
-}
-
-
 // Input parameters:
 //   R13: argument count, may be zero.
 static void PushArgumentsArray(Assembler* assembler, intptr_t arg_offset) {
@@ -368,14 +283,10 @@
 // Note: The receiver object is the first argument to the function being
 //       called, the stub accesses the receiver from this location directly
 //       when trying to resolve the call.
-void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) {
+void StubCode::GenerateInstanceFunctionLookupStub(Assembler* assembler) {
   const Immediate raw_null =
       Immediate(reinterpret_cast<intptr_t>(Object::null()));
 
-  MegamorphicLookup(assembler);
-  // Lookup in function_table_ failed, resolve, compile and enter function
-  // into function_table_.
-
   // Create a stub frame as we are pushing some objects on the stack before
   // calling into the runtime.
   AssemblerMacros::EnterStubFrame(assembler);
@@ -1681,7 +1592,7 @@
   __ cmpq(RAX, raw_null);
   __ j(NOT_EQUAL, &call_target_function, Assembler::kNearJump);
   // NoSuchMethod or closure.
-  __ jmp(&StubCode::MegamorphicLookupLabel());
+  __ jmp(&StubCode::InstanceFunctionLookupLabel());
 
   __ Bind(&found);
   // R12: Pointer to an IC data check group (classes + target)