Patchable AllocateArray stub, like instance allocation stubs.

runtime/vm/instructions_ia32_test.cc

Index: runtime/vm/instructions_ia32_test.cc
===================================================================
--- runtime/vm/instructions_ia32_test.cc	(revision 40629)
+++ runtime/vm/instructions_ia32_test.cc	(working copy)
@@ -34,7 +34,9 @@
 ASSEMBLER_TEST_GENERATE(Jump, assembler) {
   StubCode* stub_code = Isolate::Current()->stub_code();
   __ jmp(&stub_code->InvokeDartCodeLabel());
-  __ jmp(&stub_code->AllocateArrayLabel());
+  const Code& array_stub = Code::Handle(stub_code->GetAllocateArrayStub());
+  const ExternalLabel array_label(array_stub.EntryPoint());
+  __ jmp(&array_label);
   __ ret();
 }
 
@@ -53,13 +55,14 @@
             jump1.TargetAddress());
   JumpPattern jump2(test->entry() + jump1.pattern_length_in_bytes(),
                     test->code());
-  EXPECT_EQ(stub_code->AllocateArrayLabel().address(),
+  const Code& array_stub = Code::Handle(stub_code->GetAllocateArrayStub());
+  EXPECT_EQ(array_stub.EntryPoint(),
             jump2.TargetAddress());
   uword target1 = jump1.TargetAddress();
   uword target2 = jump2.TargetAddress();
   jump1.SetTargetAddress(target2);
   jump2.SetTargetAddress(target1);
-  EXPECT_EQ(stub_code->AllocateArrayLabel().address(),
+  EXPECT_EQ(array_stub.EntryPoint(),
             jump1.TargetAddress());
   EXPECT_EQ(stub_code->InvokeDartCodeLabel().address(),
             jump2.TargetAddress());