Enable debugging of RS code under GDB

- Add/integrate GDBJITRegistrar support class for interfacing with GDB
-- Once the GDBJITRegistrar is merged into LLVM trunk (and AOSP upgrades LLVM)
   all files GDB* should be removed, and replaced with appropriate includes

- Basic [host|target]-side integration tests
-- host-tests: use bcc driver and clang to verify gdb output
-- target-tests: run skeleton apk on target and verify gdb output

- Add support for optimization_level metadata in bcinfo, libbcc
-- Disabled some LTO passes when optimization_level = 0
-- move register allocator registration after metadata inspection

- Initial version of android-commands.py GDB plugin (for test infrastructure)
-- relevant commands: load-android-app, run-android-app, start-android-app
-- tested versions: gdb (7.2, 7.3), python (2.6, 2.7)

- build 'bcc' driver tool by default in eng builds

Change-Id: I99e0c11c8591c6d911632c1dcc82dd8fbe1244a8
diff --git a/lib/ExecutionEngine/Android.mk b/lib/ExecutionEngine/Android.mk
index 695a975..4aa6a3f 100644
--- a/lib/ExecutionEngine/Android.mk
+++ b/lib/ExecutionEngine/Android.mk
@@ -25,6 +25,8 @@
 libbcc_executionengine_SRC_FILES := \
   Compiler.cpp \
   FileHandle.cpp \
+  GDBJIT.cpp \
+  GDBJITRegistrar.cpp \
   Runtime.c \
   RuntimeStub.c \
   Script.cpp \