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/runtime/utils.h b/runtime/utils.h
index 73872d3..49bcbf9 100644
--- a/runtime/utils.h
+++ b/runtime/utils.h
@@ -497,6 +497,11 @@
   }
 };
 
+void PushWord(std::vector<uint8_t>* buf, int32_t data);
+
+void EncodeUnsignedLeb128(uint32_t data, std::vector<uint8_t>* buf);
+void EncodeSignedLeb128(int32_t data, std::vector<uint8_t>* buf);
+
 }  // namespace art
 
 #endif  // ART_RUNTIME_UTILS_H_