Extracts an TargetX86Base target which will be used as the common X86{32,64} implementation.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4077
R=stichnot@chromium.org

Review URL: https://codereview.chromium.org/1202533003.
diff --git a/src/IceTargetLowering.cpp b/src/IceTargetLowering.cpp
index 62c459b..7c93463 100644
--- a/src/IceTargetLowering.cpp
+++ b/src/IceTargetLowering.cpp
@@ -17,6 +17,7 @@
 
 #include "IceAssemblerARM32.h"
 #include "IceAssemblerX8632.h"
+#include "IceAssemblerX8664.h"
 #include "assembler_mips32.h"
 #include "IceCfg.h" // setError()
 #include "IceCfgNode.h"
@@ -27,6 +28,7 @@
 #include "IceTargetLoweringARM32.h"
 #include "IceTargetLoweringMIPS32.h"
 #include "IceTargetLoweringX8632.h"
+#include "IceTargetLoweringX8664.h"
 
 namespace Ice {