Use off-heap data for class check instructions

runtime/vm/assembler_arm64.h

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_ASSEMBLER_ARM64_H_
 #define RUNTIME_VM_ASSEMBLER_ARM64_H_
 
 #ifndef RUNTIME_VM_ASSEMBLER_H_
 #error Do not include assembler_arm64.h directly; use assembler.h instead.
 #endif
@@ skipping 1126 matching lines @@
   void SmiTag(Register reg) { LslImmediate(reg, reg, kSmiTagSize); }
   void SmiTag(Register dst, Register src) {
     LslImmediate(dst, src, kSmiTagSize);
   }
 
   void BranchIfNotSmi(Register reg, Label* label) {
     tsti(reg, Immediate(kSmiTagMask));
     b(label, NE);
   }
 
+  void BranchIfSmi(Register reg, Label* label) {
+    tsti(reg, Immediate(kSmiTagMask));
+    b(label, EQ);
+  }
+
   void Branch(const StubEntry& stub_entry,
               Register pp,
               Patchability patchable = kNotPatchable);
   void BranchPatchable(const StubEntry& stub_entry);
 
   void BranchLink(const StubEntry& stub_entry,
                   Patchability patchable = kNotPatchable);
 
   void BranchLinkPatchable(const StubEntry& stub_entry);
   void BranchLinkToRuntime();
 
   // Emit a call that shares its object pool entries with other calls
   // that have the same equivalence marker.
   void BranchLinkWithEquivalence(const StubEntry& stub_entry,
                                  const Object& equivalence);
 
   // Macros accepting a pp Register argument may attempt to load values from
   // the object pool when possible. Unless you are sure that the untagged object
   // pool pointer is in another register, or that it is not available at all,
   // PP should be passed for pp.
+  void AddImmediate(Register dest, int64_t imm);

[Vyacheslav Egorov (Google), 2017/05/09 21:07:27]

It does not seem like anybody is actually using this function.

[erikcorry, 2017/05/10 08:47:43]

Gone

   void AddImmediate(Register dest, Register rn, int64_t imm);
   void AddImmediateSetFlags(Register dest, Register rn, int64_t imm);
   void SubImmediateSetFlags(Register dest, Register rn, int64_t imm);
   void AndImmediate(Register rd, Register rn, int64_t imm);
   void OrImmediate(Register rd, Register rn, int64_t imm);
   void XorImmediate(Register rd, Register rn, int64_t imm);
   void TestImmediate(Register rn, int64_t imm);
   void CompareImmediate(Register rn, int64_t imm);
 
   void LoadFromOffset(Register dest,
@@ skipping 736 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_ASSEMBLER_ARM64_H_