Fix some ArtMethod related bugs

Added root visiting for runtime methods, not currently required
since the GcRoots in these methods are null.

Added missing GetInterfaceMethodIfProxy in GetMethodLine, fixes
--trace run-tests 005, 044.

Fixed optimizing compiler bug where we used a normal stack location
instead of double on ARM64, this fixes the debuggable tests.

TODO: Fix JDWP tests.

Bug: 19264997

Change-Id: I7c55f69c61d1b45351fd0dc7185ffe5efad82bd3
diff --git a/runtime/trace.cc b/runtime/trace.cc
index 13efb53..d3b3af8 100644
--- a/runtime/trace.cc
+++ b/runtime/trace.cc
@@ -879,6 +879,7 @@
 
 static std::string GetMethodLine(ArtMethod* method)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+  method = method->GetInterfaceMethodIfProxy(sizeof(void*));
   return StringPrintf("%p\t%s\t%s\t%s\t%s\n", method,
       PrettyDescriptor(method->GetDeclaringClassDescriptor()).c_str(), method->GetName(),
       method->GetSignature().ToString().c_str(), method->GetDeclaringClassSourceFile());