ADDITIONAL SYSTEM INFORMATION :
# JRE version: OpenJDK Runtime Environment (8.0_392) (build 1.8.0_392-internal-fastdebug-b00)
# Java VM: OpenJDK 64-Bit Server VM (25.392-b00-fastdebug compiled mode linux-amd64 compressed oops)

A DESCRIPTION OF THE PROBLEM :
I ran a modified testcase using JDK8u392 and I found the JVM crashed under the option  -Xcomp  -XX:+UnlockExperimentalVMOptions  -XX:+AggressiveUnboxing

# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/data/jdk8u/hotspot/src/share/vm/opto/phaseX.cpp:471), pid=20619, tid=0x00007f1ffa050700
#  assert(!n->is_Phi() || n->as_Phi()->inst_mem_id() == -1) failed: should not be linked to data Phi
#
# JRE version: OpenJDK Runtime Environment (8.0_392) (build 1.8.0_392-internal-fastdebug-b00)
# Java VM: OpenJDK 64-Bit Server VM (25.392-b00-fastdebug compiled 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
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.java.com/bugreport/crash.jsp

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
java  -Xcomp  -XX:+UnlockExperimentalVMOptions  -XX:+AggressiveUnboxing  TestDoubleBoxing

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Passed
ACTUAL -
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc:  SuppressErrorAt=/phaseX.cpp:471
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/data/jdk8u/hotspot/src/share/vm/opto/phaseX.cpp:471), pid=17724, tid=0x00007f636a959700
#  assert(!n->is_Phi() || n->as_Phi()->inst_mem_id() == -1) failed: should not be linked to data Phi
#
# JRE version: OpenJDK Runtime Environment (8.0_392) (build 1.8.0_392-internal-fastdebug-b00)
# Java VM: OpenJDK 64-Bit Server VM (25.392-b00-fastdebug compiled 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/repository/bugs/TestDoubleBoxing_09_21_14_55_28/hs_err_pid17724.log
#
# Compiler replay data is saved as:
# /home/repository/bugs/TestDoubleBoxing_09_21_14_55_28/replay_pid17724.log
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.java.com/bugreport/crash.jsp
#
Current thread is 140064966678272
Dumping core ...


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