Revert "Revert "ART: Split out more cases of Load/StoreRef, volatile as parameter""

This reverts commit de68676b24f61a55adc0b22fe828f036a5925c41.

Fixes an API comment, and differentiates between inserting and appending.

Change-Id: I0e9a21bb1d25766e3cbd802d8b48633ae251a6bf
diff --git a/compiler/dex/compiler_enums.h b/compiler/dex/compiler_enums.h
index de9ac4b..caecb7a 100644
--- a/compiler/dex/compiler_enums.h
+++ b/compiler/dex/compiler_enums.h
@@ -527,6 +527,13 @@
 
 std::ostream& operator<<(std::ostream& os, const FixupKind& kind);
 
+enum VolatileKind {
+  kNotVolatile,      // Load/Store is not volatile
+  kVolatile          // Load/Store is volatile
+};
+
+std::ostream& operator<<(std::ostream& os, const VolatileKind& kind);
+
 }  // namespace art
 
 #endif  // ART_COMPILER_DEX_COMPILER_ENUMS_H_