win32 build had single assert crash when running jdk regression test: java/lang/invoke/VarHandles/VarHandleTestMethodHandleAccessString.java

vmoptions used: -server -Xmixed -XX:+CreateCoredumpOnCrash -XX:+IgnoreUnrecognizedVMOptions -XX:ReservedCodeCacheSize=256M -Xmixed

re-launch haven't reproduced this problem.

# Internal Error (C:\jprt\T\P1\204125.amurillo\s\hotspot\src\share\vm\opto\escape.cpp:209), pid=91892, tid=135552
# assert(ptn->as_LocalVar()->edge_count() > 0) failed: sanity
#
# JRE version: Java(TM) SE Runtime Environment (9.0) (fastdebug build 9-internal+0-2016-04-04-204125.amurillo.jdk9-hs-2016-04-04-snapshot)
# Java VM: Java HotSpot(TM) Server VM (fastdebug 9-internal+0-2016-04-04-204125.amurillo.jdk9-hs-2016-04-04-snapshot, mixed mode, tiered, g1 gc, windows-x86)
# Core dump will be written. Default location: C:\Users\aurora\sandbox\results\workDir\java\lang\invoke\VarHandles\VarHandleTestMethodHandleAccessString\hs_err_pid91892.mdmp
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#