x86_64 Assembler Test Infrastructure, fix x86_64 assembler

Some infrastructure to do real assembler testing. Need to extend to
other assemblers, and a lot more tests.

Fix some of the cases of the x86_64 assembler.

Change-Id: I15b5f3a094af469130db68a95a66602cf30d8fc4
diff --git a/build/Android.gtest.mk b/build/Android.gtest.mk
index 2358391..f25217f 100644
--- a/build/Android.gtest.mk
+++ b/build/Android.gtest.mk
@@ -105,7 +105,8 @@
 
 COMPILER_GTEST_HOST_SRC_FILES := \
 	$(COMPILER_GTEST_COMMON_SRC_FILES) \
-	compiler/utils/x86/assembler_x86_test.cc
+	compiler/utils/x86/assembler_x86_test.cc \
+	compiler/utils/x86_64/assembler_x86_64_test.cc
 
 ART_HOST_GTEST_EXECUTABLES :=
 ART_TARGET_GTEST_EXECUTABLES$(ART_PHONY_TEST_TARGET_SUFFIX) :=