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/compiler.cc b/compiler/compiler.cc
index 1626317..c500921 100644
--- a/compiler/compiler.cc
+++ b/compiler/compiler.cc
@@ -47,12 +47,12 @@
   if (code_item.insns_size_in_code_units_ >= UINT16_MAX / 4) {
     LOG(INFO) << "Method exceeds compiler instruction limit: "
               << code_item.insns_size_in_code_units_
-              << " in " << PrettyMethod(method_idx, dex_file);
+              << " in " << dex_file.PrettyMethod(method_idx);
     return true;
   }
   if (code_item.registers_size_ >= UINT16_MAX / 4) {
     LOG(INFO) << "Method exceeds compiler virtual register limit: "
-              << code_item.registers_size_ << " in " << PrettyMethod(method_idx, dex_file);
+              << code_item.registers_size_ << " in " << dex_file.PrettyMethod(method_idx);
     return true;
   }
   return false;