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 mixed mode linux-amd64 compressed oops)

A DESCRIPTION OF THE PROBLEM :
I ran a modified regression test case on JDK8u392 and found that the JVM crashed with -XX:-TieredCompilation options.

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/xxxxx/jdk8u/hotspot/src/share/vm/opto/chaitin.cpp:1600), pid=79700, tid=0x00007f4c4af5f700
# assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
#
# 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 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
#
# 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 -XX:-TieredCompilation compiler.c2.TestRemoveMemBarPrecEdge

ACTUAL -
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/chaitin.cpp:1600
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/xxxxx/jdk8u/hotspot/src/share/vm/opto/chaitin.cpp:1600), pid=79700, tid=0x00007f4c4af5f700
# assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc
#
# 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 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:
# /xxxxx/hs_err_pid79700.log
#
# Compiler replay data is saved as:
# /xxxxx/replay_pid79700.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#

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The source code is attached
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