hg: jdk/sandbox: 8249809: avoid calling DirectiveSet::clone(this) in compilecommand_compatibility_init

[chris.hegarty at oracle.com]

Changeset: b0553ba43ba1
Author:    xliu
Date:      2020-07-31 11:35 -0700
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/b0553ba43ba1

8249809: avoid calling DirectiveSet::clone(this) in compilecommand_compatibility_init
Summary: Add DirectiveSet smart pointer to isolate cloning
Reviewed-by: simonis, thartmann

! src/hotspot/share/compiler/compilerDirectives.cpp