Add more arithmetic to x64 assembler.

src/x64/assembler-x64-inl.h

Index: src/x64/assembler-x64-inl.h
===================================================================
--- src/x64/assembler-x64-inl.h	(revision 2069)
+++ src/x64/assembler-x64-inl.h	(working copy)
@@ -41,8 +41,6 @@
 // -----------------------------------------------------------------------------
 // Implementation of Assembler
 
-#define EMIT(x)                                 \
-  *pc_++ = (x)
 
 
 void Assembler::emitl(uint32_t x) {
@@ -60,7 +58,7 @@
 // High bit of reg goes to REX.R, high bit of rm_reg goes to REX.B.
 // REX.W is set.
 void Assembler::emit_rex_64(Register reg, Register rm_reg) {
-  EMIT(0x48 | (reg.code() & 0x8) >> 1 | rm_reg.code() >> 3);
+  emit(0x48 | (reg.code() & 0x8) >> 1 | rm_reg.code() >> 3);
 }
 
 
@@ -68,7 +66,7 @@
 // register is used for REX.B, and the high bit of op's index register
 // is used for REX.X.  REX.W is set.
 void Assembler::emit_rex_64(Register reg, const Operand& op) {
-  EMIT(0x48 | (reg.code() & 0x8) >> 1 | op.rex_);
+  emit(0x48 | (reg.code() & 0x8) >> 1 | op.rex_);
 }
 
 
@@ -82,9 +80,7 @@
   return NULL;
 }
 
-#undef EMIT
 
-
 // -----------------------------------------------------------------------------
 // Implementation of RelocInfo