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/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index 4370a84..6ba0963 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -173,7 +173,7 @@
   const char* GetMethodName() {
     // PrettyMethod() is expensive, so we delay calling it until we actually have to.
     if (cached_method_name_.empty()) {
-      cached_method_name_ = PrettyMethod(graph_->GetMethodIdx(), graph_->GetDexFile());
+      cached_method_name_ = graph_->GetDexFile().PrettyMethod(graph_->GetMethodIdx());
     }
     return cached_method_name_.c_str();
   }
@@ -1044,7 +1044,7 @@
       if (kArenaAllocatorCountAllocations) {
         if (arena.BytesAllocated() > kArenaAllocatorMemoryReportThreshold) {
           MemStats mem_stats(arena.GetMemStats());
-          LOG(INFO) << PrettyMethod(method_idx, dex_file) << " " << Dumpable<MemStats>(mem_stats);
+          LOG(INFO) << dex_file.PrettyMethod(method_idx) << " " << Dumpable<MemStats>(mem_stats);
         }
       }
     }
@@ -1066,7 +1066,7 @@
     // instruction set is supported -- and has support for read
     // barriers, if they are enabled). This makes sure we're not
     // regressing.
-    std::string method_name = PrettyMethod(method_idx, dex_file);
+    std::string method_name = dex_file.PrettyMethod(method_idx);
     bool shouldCompile = method_name.find("$opt$") != std::string::npos;
     DCHECK((method != nullptr) || !shouldCompile) << "Didn't compile " << method_name;
   }
@@ -1131,7 +1131,7 @@
     if (kArenaAllocatorCountAllocations) {
       if (arena.BytesAllocated() > kArenaAllocatorMemoryReportThreshold) {
         MemStats mem_stats(arena.GetMemStats());
-        LOG(INFO) << PrettyMethod(method_idx, *dex_file) << " " << Dumpable<MemStats>(mem_stats);
+        LOG(INFO) << dex_file->PrettyMethod(method_idx) << " " << Dumpable<MemStats>(mem_stats);
       }
     }
   }