Emit CFI for x86 & x86_64 JNI compiler.

Now for host-side x86 & x86_64 ART, we are able to get complete stacktrace with even mixed C/C++ & Java stack frames.

Testing:
1. art/test/run-test --host --gdb [--64] --no-relocate 005
2. In gdb, run 'b art::Class_classForName' which is implementation of a Java native method, then 'r'
3. In gdb, run 'bt'. You should see stack frames down to main()

Change-Id: I2d17e9aa0f6d42d374b5362a15ea35a2fce96302
diff --git a/compiler/Android.mk b/compiler/Android.mk
index 7983040..5c5163d 100644
--- a/compiler/Android.mk
+++ b/compiler/Android.mk
@@ -107,6 +107,7 @@
 	utils/arm64/assembler_arm64.cc \
 	utils/arm64/managed_register_arm64.cc \
 	utils/assembler.cc \
+	utils/dwarf_cfi.cc \
 	utils/mips/assembler_mips.cc \
 	utils/mips/managed_register_mips.cc \
 	utils/x86/assembler_x86.cc \