8270993: Missing forward declaration of ZeroFrame

Reviewed-by: kvn

Author: JesperIRL

src/hotspot/share/runtime/javaFrameAnchor.hpp

@@ -35,6 +35,7 @@
 class JavaThread;
 class MacroAssembler;
 class ProgrammableUpcallHandler;
+class ZeroFrame;
 
 class JavaFrameAnchor {
 // Too many friends...