RFR(M): 8205207: Port Graal unit tests under jtreg

[Ekaterina Pavlova]

Hi All,

please review porting of Graal unit tests under jtreg. The main idea of this porting is to keep Graal unit tests as is
(located in src/jdk.internal.vm.compiler/share/classes/*.test) and run them similar way they are run in Graal project.
To achieve this test/hotspot/jtreg/compiler/graalunit/common/GraalUnitTestLauncher.java helper class has been written
which simply launches com.oracle.mxtool.junit.MxJUnitWrapper to run specified set of Graal unit tests. The groups of
Graal unit tests to run are defined in auto-generated test/hotspot/jtreg/compiler/graalunit/*.java jtreg tests.

New make/test/JtregGraalUnit.gmk is used to build Graal unit tests into jdk.vm.compiler.tests.jar and then install
it in $(TEST_IMAGE_DIR)/hotspot/jtreg/graal/.

make/Main.gmk adds proper dependencies for build-test-hotspot-jtreg-graal and test-image-hotspot-jtreg-graal.

test/TestCommon.gmk passes TEST_IMAGE_GRAAL_DIR to jtreg so jtreg knows where to find Graal tests and libs.

test/hotspot/jtreg/compiler/graalunit/TestPackages.txt file defines "testName -> testPrefix [requiresStatement]" mapping
which is used by test/hotspot/jtreg/compiler/graalunit/generateTests.sh script to generate jtreg tests.

test/hotspot/jtreg/compiler/graalunit/com.oracle.mxtool.junit was ported from mx project without any changes.


     JBS: https://bugs.openjdk.java.net/browse/JDK-8205207
  webrev: http://cr.openjdk.java.net/~epavlova//8205207/webrev.00/index.html
testing: new tests were executed as part of automatic HS testing for several months.


thanks,
-katya

p.s.
  Igor Ignatyev volunteered to sponsor this change.