Make --debuggable rely on JIT code.

Removes -Xfully-deoptable in the process, which was added as a
temporary workaround until this CL.
Partial revert of https://android-review.googlesource.com/#/c/302232/

Makes things consistent with existing infrastructure:

- Parse the --debuggable from the compiler options, just like
  --compiler-filter.

- Add DEBUG_JAVA_DEBUGGABLE, passed by the zygote, for debuggable apps.

- Java debuggable now solely relies on JIT for simplicity.

- Debugging under userdebug for non-java-debuggable apps is still
  best effort.

Test: test-art-host, jdwp

bug: 28769520
Change-Id: Id0593aacd85b9780da97f20914a50943957c858f
diff --git a/compiler/jit/jit_compiler.cc b/compiler/jit/jit_compiler.cc
index 148ce4f..eaac0b4 100644
--- a/compiler/jit/jit_compiler.cc
+++ b/compiler/jit/jit_compiler.cc
@@ -102,7 +102,7 @@
       /* no_inline_from */ nullptr,
       /* include_patch_information */ false,
       CompilerOptions::kDefaultTopKProfileThreshold,
-      Runtime::Current()->IsDebuggable(),
+      Runtime::Current()->IsJavaDebuggable(),
       CompilerOptions::kDefaultGenerateDebugInfo,
       /* implicit_null_checks */ true,
       /* implicit_so_checks */ true,