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/compiler/jit/jit_compiler.cc b/compiler/jit/jit_compiler.cc
index 4ef2db8..c398703 100644
--- a/compiler/jit/jit_compiler.cc
+++ b/compiler/jit/jit_compiler.cc
@@ -208,7 +208,7 @@
   // Ensure the class is initialized.
   Handle<mirror::Class> h_class(hs.NewHandle(method->GetDeclaringClass()));
   if (!runtime->GetClassLinker()->EnsureInitialized(self, h_class, true, true)) {
-    VLOG(jit) << "JIT failed to initialize " << PrettyMethod(method);
+    VLOG(jit) << "JIT failed to initialize " << method->PrettyMethod();
     return false;
   }
 
@@ -226,7 +226,7 @@
              << " "
              << code_cache->GetMemorySizeOfCodePointer(ptr)
              << " "
-             << PrettyMethod(method)
+             << method->PrettyMethod()
              << std::endl;
       std::string str = stream.str();
       bool res = perf_file_->WriteFully(str.c_str(), str.size());