Add oat file generation and tests to build

- Currently builds boot.oat for host and target
  and target oat files for art tests.
- Added cross compilation support via --strip-prefix option to dex2oat
- Reduced output to prevent build log spam (Compiler::verbose_)
- Added image roots for recovering important pointers on image load
- Redid JNI stub creation and made the stub array an image root
- Fixed JNI stub test by making JNI stub array executable
- Fixed JNI UnregisterNative to having it reinstall the JNI stub
- Fixed ARM JNI stub to generate PIC code (with irogers)
- Fixed JniCompiler to generate PIC code (with irogers)
- Fixed FindNativeMethod to handle recursive calls
- Finished checkFieldType to use Object::InstanceOf
- Fixed thread unsafe access to ClassLinker::{dex_files_,dex_caches_}
- Added ResolvedMethod variant for use with Method* for context
- Fixed ImageWriter to call FixupMethod
- Fixed ImageWriter to rewrite JNI stub references
- Improved error reporting on lack of ANDROID_DATA dir or art-cache dir
- Fixed Runtime::Start to InitLibraries before creating thread peer
- Implemented Space::IsCondemned to skip spaces loaded from images
- Implemented artFindInterfaceMethodInCache,
  allowing interface invocation from managed code

Change-Id: I603e97fa0ac44508ae05a2e47c1cdb4481678d7b
diff --git a/src/assembler_x86.cc b/src/assembler_x86.cc
index c303fb1..45c0086 100644
--- a/src/assembler_x86.cc
+++ b/src/assembler_x86.cc
@@ -1654,9 +1654,15 @@
 }
 
 void X86Assembler::Call(FrameOffset base, Offset offset, ManagedRegister) {
+  // TODO: Needed for:
+  // JniCompilerTest.CompileAndRunIntObjectObjectMethod
+  // JniCompilerTest.CompileAndRunStaticIntObjectObjectMethod
+  // JniCompilerTest.CompileAndRunStaticSynchronizedIntObjectObjectMethod
+  // JniCompilerTest.ReturnGlobalRef
   UNIMPLEMENTED(FATAL);
 }
 
+// TODO: remove this generator of non-PIC code
 void X86Assembler::Call(uintptr_t addr, ManagedRegister mscratch) {
   Register scratch = mscratch.AsX86().AsCpuRegister();
   movl(scratch, Immediate(addr));