C2 creates incorrect cast after eliminating phi with unique input

The test java/lang/invoke/VarargsArrayTest.java fails in the compiler nightlies of 2016-04-01 due to the following assert:

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (C:\jprt\T\P1\153346.dmitrij\s\hotspot\src\share\vm\opto\castnode.cpp:333), pid=62836, tid=64164
# Error: assert(jptr) failed
#
# JRE version: Java(TM) SE Runtime Environment (9.0) (fastdebug build 9-internal+0-2016-04-01-153346.dmitrij.hs-comp)
# Java VM: Java HotSpot(TM) Server VM (fastdebug 9-internal+0-2016-04-01-153346.dmitrij.hs-comp, compiled mode, tiered, g1 gc, windows-x86)
# Core dump will be written. Default location: C:\Users\aurora\sandbox\results\workDir\java\lang\invoke\VarargsArrayTest\hs_err_pid62836.mdmp