Make ClassLinker set Class::super_class_ plus test and build improvements

Create placeholder ClassLinker::java_lang_Object_ for use a
super-class of java_lang_Class_ instances.

	src/class_linker.cc
	src/class_linker.h

Expand ClassLinker FindClass test to verify Class::GetSuperClass

	src/class_linker_test.cc

Move DexFile::Load* methods to ClassLinker so they can reference
java_lang_Object_ and java_lang_Class_

	src/class_linker.cc
	src/class_linker.h
	src/dex_file.cc
	src/dex_file.h

Move corresponding Load tests from class_linker_test to dex_file_test

	src/class_linker_test.cc
	src/dex_file_test.cc

Tracking change to object_test to use ClassLinker::Load* methods

	src/object_test.cc

Move base64 to new src/common_test.h for reuse accross tests. Add
missing example source for MyClass dex.

	src/common_test.h
	src/class_linker_test.cc
	src/dex_file_test.cc
	src/object_test.cc

Change Heap::AllocClass to take DexFile argument

	src/heap.h

Remove Method::dex_file_ in favor of using Method::GetClass::GetDexFile

	src/object.cc
	src/object.h

Made a few more RawDexFile methods const

	src/raw_dex_file.cc
	src/raw_dex_file.h

Add convenience targets for build-art and test-art-host

	Android.mk

Drop use of _LOCAL_ from make variants, which isn't the appropriate
here, where we aren't differentiating between LOCAL_ and PRIVATE_.
Avoid redefinition of variables based on now removed
LIBART_TARGET_ARCH and TEST_TARGET_ARCH to support phony targets in
Android.mk

	build/Android.aexec.host.mk
	build/Android.aexec.mk
	build/Android.common.mk
	build/Android.libart.host.mk
	build/Android.libart.mk
	build/Android.test.host.mk
	build/Android.test.mk

Change-Id: I84ce2b7a2b4e37799d4d782b97c02d5e97ac081c
diff --git a/Android.mk b/Android.mk
index 4290364..e32cc7a 100644
--- a/Android.mk
+++ b/Android.mk
@@ -27,3 +27,18 @@
     include $(build_path)/Android.test.host.mk
     include $(build_path)/Android.aexec.host.mk
 endif
+
+
+# "m build-art" for quick minimal build
+.PHONY: build-art
+build-art: \
+    $(TARGET_OUT_EXECUTABLES)/aexec \
+    $(foreach file,$(TEST_TARGET_SRC_FILES),$(TARGET_OUT_EXECUTABLES)/$(notdir $(file:%.cc=%))) \
+    $(HOST_OUT_EXECUTABLES)/aexec \
+    $(foreach file,$(TEST_HOST_SRC_FILES),$(HOST_OUT_EXECUTABLES)/$(notdir $(file:%.cc=%))) \
+#
+
+# "mm test-art-host" to build and run all host tests
+.PHONY: test-art-host
+test-art-host: $(foreach file,$(TEST_HOST_SRC_FILES),$(HOST_OUT_EXECUTABLES)/$(notdir $(file:%.cc=%)))
+	$(foreach file,$(TEST_HOST_SRC_FILES),$(HOST_OUT_EXECUTABLES)/$(notdir $(file:%.cc=%)) &&) true