Exercise the generation of SBFX on ARM32 & Thumb-2.

Exercise the generation of the ARM SBFX intruction in
compiler/utils/arm/assembler_arm32_test.cc (ARM
instruction set encoding) and in
compiler/utils/arm/assembler_thumb2_test.cc (Thumb
instruction set encoding).

Change-Id: Ic72683aac6dd6628e227523e352c395e1a63b52e
diff --git a/build/Android.gtest.mk b/build/Android.gtest.mk
index 2951350..a8041c5 100644
--- a/build/Android.gtest.mk
+++ b/build/Android.gtest.mk
@@ -186,7 +186,9 @@
 
 COMPILER_GTEST_HOST_SRC_FILES := \
   $(COMPILER_GTEST_COMMON_SRC_FILES) \
-  compiler/utils//assembler_thumb_test.cc \
+  compiler/utils/arm/assembler_arm32_test.cc \
+  compiler/utils/arm/assembler_thumb2_test.cc \
+  compiler/utils/assembler_thumb_test.cc \
   compiler/utils/x86/assembler_x86_test.cc \
   compiler/utils/x86_64/assembler_x86_64_test.cc