Remove mirror:: and ArtMethod deps in utils.{h,cc}

The latest chapter in the ongoing saga of attempting to dump a DEX
file without having to start a whole runtime instance.  This episode
finds us removing references to ArtMethod/ArtField/mirror.

One aspect of this change that I would like to call out specfically
is that the utils versions of the "Pretty*" functions all were written
to accept nullptr as an argument.  I have split these functions up as
follows:
1) an instance method, such as PrettyClass that obviously requires
this != nullptr.
2) a static method, that behaves the same way as the util method, but
calls the instance method if p != nullptr.
This requires using a full class qualifier for the static methods,
which isn't exactly beautiful.  I have tried to remove as many cases
as possible where it was clear p != nullptr.

Bug: 22322814
Test: test-art-host
Change-Id: I21adee3614aa697aa580cd1b86b72d9206e1cb24
diff --git a/runtime/entrypoints/entrypoint_utils.cc b/runtime/entrypoints/entrypoint_utils.cc
index f8deb8f..cbefbba 100644
--- a/runtime/entrypoints/entrypoint_utils.cc
+++ b/runtime/entrypoints/entrypoint_utils.cc
@@ -61,12 +61,12 @@
   if (UNLIKELY(klass->IsPrimitive() && !klass->IsPrimitiveInt())) {
     if (klass->IsPrimitiveLong() || klass->IsPrimitiveDouble()) {
       ThrowRuntimeException("Bad filled array request for type %s",
-                            PrettyDescriptor(klass).c_str());
+                            klass->PrettyDescriptor().c_str());
     } else {
       self->ThrowNewExceptionF(
           "Ljava/lang/InternalError;",
           "Found type %s; filled-new-array not implemented for anything but 'int'",
-          PrettyDescriptor(klass).c_str());
+          klass->PrettyDescriptor().c_str());
     }
     return nullptr;  // Failure
   }
@@ -77,7 +77,7 @@
       return nullptr;  // Failure
     }
   }
-  DCHECK(klass->IsArrayClass()) << PrettyClass(klass);
+  DCHECK(klass->IsArrayClass()) << klass->PrettyClass();
   return klass;
 }
 
@@ -131,8 +131,8 @@
   if (!o->InstanceOf(return_type)) {
     Runtime::Current()->GetJavaVM()->JniAbortF(nullptr,
                                                "attempt to return an instance of %s from %s",
-                                               PrettyTypeOf(o.Get()).c_str(),
-                                               PrettyMethod(method).c_str());
+                                               o->PrettyTypeOf().c_str(),
+                                               method->PrettyMethod().c_str());
   }
 }