X64 Crank: Implemented DoBranch and all *AndBranch comparisons.

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 30b9ba515278f1b62d9afc027d46cbcbd8822cb3..b2d085f9050603cea10da75c20b28b77548cd0ef 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -272,6 +272,7 @@ class MacroAssembler: public Assembler {
 
   // Is the value a tagged smi.
   Condition CheckSmi(Register src);
+  Condition CheckSmi(const Operand& src);
 
   // Is the value a non-negative tagged smi.
   Condition CheckNonNegativeSmi(Register src);
@@ -590,6 +591,13 @@ class MacroAssembler: public Assembler {
   void Call(ExternalReference ext);
   void Call(Handle<Code> code_object, RelocInfo::Mode rmode);
 
+  // Non-x64 instructions.
+  // Push/pop all general purpose registers.
+  // Does not push rsp/rbp nor any of the assembler's special purpose registers
+  // (kScratchRegister, kSmiConstantRegister, kRootRegister).
+  void Pushad();
+  void Popad();
+
   // Compare object type for heap object.
   // Always use unsigned comparisons: above and below, not less and greater.
   // Incoming register is heap_object and outgoing register is map.