Rename ObjPtr::Decode to ObjPtr::Ptr

Done to prevent ambiguity with ScopedObjectAccess::Decode.

Bug: 31113334

Test: test-art-host
Change-Id: I07a2497cc9cf66386311798933547471987fc316
diff --git a/compiler/driver/compiler_driver-inl.h b/compiler/driver/compiler_driver-inl.h
index 9efd636..d807fca 100644
--- a/compiler/driver/compiler_driver-inl.h
+++ b/compiler/driver/compiler_driver-inl.h
@@ -33,7 +33,7 @@
 
 inline mirror::ClassLoader* CompilerDriver::GetClassLoader(const ScopedObjectAccess& soa,
                                                            const DexCompilationUnit* mUnit) {
-  return soa.Decode<mirror::ClassLoader>(mUnit->GetClassLoader()).Decode();
+  return soa.Decode<mirror::ClassLoader>(mUnit->GetClassLoader()).Ptr();
 }
 
 inline mirror::Class* CompilerDriver::ResolveClass(
@@ -98,7 +98,7 @@
   DCHECK(!resolved_field->IsStatic());
   ObjPtr<mirror::Class> fields_class = resolved_field->GetDeclaringClass();
   bool fast_get = referrer_class != nullptr &&
-      referrer_class->CanAccessResolvedField(fields_class.Decode(),
+      referrer_class->CanAccessResolvedField(fields_class.Ptr(),
                                              resolved_field,
                                              dex_cache,
                                              field_idx);
@@ -150,7 +150,7 @@
       return std::make_pair(true, true);
     }
     if (CanAccessResolvedMember<ArtMember>(
-        referrer_class, members_class.Decode(), resolved_member, dex_cache, member_idx)) {
+        referrer_class, members_class.Ptr(), resolved_member, dex_cache, member_idx)) {
       // We have the resolved member, we must make it into a index for the referrer
       // in its static storage (which may fail if it doesn't have a slot for it)
       // TODO: for images we can elide the static storage base null check