Test80003111 fails after latest changes to parallelize string and symbol table unlink with the following guarantee failing:

# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/g1CollectedHeap.cpp:5230
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/home/thomas/Downloads/vmshare/jdk9-review/src/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp:5230), pid=10808, tid=140684561352448
# guarantee(!_process_symbols || _do_in_parallel || SymbolTable::parallel_claimed_index() >= _initial_symbol_table_size) failed: claim value 0 after unlink less than initial symbol table size 20011
#
# JRE version: Java(TM) SE Runtime Environment (9.0-b01) (build 1.9.0-ea-b01)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.0-b62-internal-debug mixed mode linux-amd64 compressed oops)
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /home/thomas/Downloads/vmshare/jdk9-review/src/test/JTwork/scratch/hs_err_pid10808.log
#
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Problem is that when not parallelizing the symbol/string table scanning, the claim index is not updated and remains zero.

Proposed fix: modify the guarantee to only check in case of parallel operation.