Use a dedicated property file for GraalVM.

Author: ansalond

mx.truffleruby/graalvm.properties

@@ -0,0 +1,20 @@
+# This file contains native-image arguments needed to build truffleruby
+#
+
+ImageName = ruby
+
+Requires = tool:truffle
+
+LauncherClass = org.truffleruby.launcher.RubyLauncher
+LauncherClassPath = languages/ruby/truffleruby-annotations.jar:languages/ruby/truffleruby-shared.jar:lib/graalvm/launcher-common.jar:lib/graalvm/truffleruby-launcher.jar
+
+Args = -H:MaxRuntimeCompileMethods=5400 \
+       -H:SubstitutionResources=org/truffleruby/aot/substitutions.json \
+       -H:+AddAllCharsets
+
+# Pass the home for context pre-initialization
+# ${.} expands to the destination Ruby home created by mx fetch-languages,
+# such as substratevm/svmbuild/native-image-root/languages/ruby.
+JavaArgs = -Dtruffleruby.preinitialization.home=${.} \
+           -Dpolyglot.engine.PreinitializeContexts=ruby \
+           -Dorg.graalvm.launcher.standalone=false

mx.truffleruby/suite.py

@@ -398,8 +398,8 @@
                     "file:lib",  # contains some results from truffleruby-cext
                     "file:CHANGELOG.md",
                     "file:mx.truffleruby/GraalCE_Ruby_license_3rd_party_license.txt",
-                    "file:mx.truffleruby/native-image.properties",
                 ],
+                "native-image.properties" : ["file:mx.truffleruby/graalvm.properties"],
                 "bin/" : [
                     "file:bin/gem",
                     "file:bin/irb",