RFR (S) 8009829: CDS: JDK JPRT test fails crash in Symbol::equals()

[Coleen Phillimore]

Summary: -Xshare:dump was creating a Symbol in C_heap.  There's an 
assert there that jdk jprt wasn't hitting because it was only done in 
product

Tested with -Xshare:dump and jdk/test/sun/nio/cs tests.

open webrev at http://cr.openjdk.java.net/~coleenp/8009829/
bug link at http://bugs.sun.com/view_bug.do?bug_id=8009829  (might not 
be there yet)
local bug link https://jbs.oracle.com/bugs/browse/JDK-8009829

thanks,
Coleen