X64: Extract all smi operations into MacroAssembler macros.

src/x64/assembler-x64.cc

Index: src/x64/assembler-x64.cc
diff --git a/src/x64/assembler-x64.cc b/src/x64/assembler-x64.cc
index 6304324da0d6ee5c93e98781eb40728a06301133..588bb60ddce9d2e458fce40ffa1836d3c65d3c9d 100644
--- a/src/x64/assembler-x64.cc
+++ b/src/x64/assembler-x64.cc
@@ -362,7 +362,7 @@ void Assembler::bind(Label* L) {
 
 
 void Assembler::GrowBuffer() {
-  ASSERT(overflow());  // should not call this otherwise
+  ASSERT(buffer_overflow());  // should not call this otherwise
   if (!own_buffer_) FATAL("external code buffer is too small");
 
   // compute new buffer size
@@ -424,7 +424,7 @@ void Assembler::GrowBuffer() {
     }
   }
 
-  ASSERT(!overflow());
+  ASSERT(!buffer_overflow());
 }
 
 
@@ -1406,6 +1406,15 @@ void Assembler::neg(Register dst) {
 }
 
 
+void Assembler::negl(Register dst) {
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  emit_optional_rex_32(dst);
+  emit(0xF7);
+  emit_modrm(0x3, dst);
+}
+
+
 void Assembler::neg(const Operand& dst) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;