8325042: Remove unused JVMDITools test files

Backport-of: 0cc8e5beed664a21c2668be86a9d3c5a1b165743

Author: GoeLin

test/hotspot/jtreg/vmTestbase/nsk/share/JVMDITools.cpp

@@ -59,8 +59,6 @@ Short description of files:
         Denotation.java, TreeNodesDenotation.java
     RAS mode support:
         RASagent.java, JVMTIagent.c
-    JVMDI tests support:
-        JVMDITools.h, JVMDITools.c
 
 Short description of subdirectories: