RFR: 8160088: update hotspot tests depending on GC to use @requires vm.gc.X

[Dmitry Fazunenko]

Hello,

I'm looking for Reviewers for relatively simple fix which affects 59 tests.
   https://bugs.openjdk.java.net/browse/JDK-8160088
   http://cr.openjdk.java.net/~dfazunen/8160088/webrev.00/

The fix allows to skip execution of tests requiring a specific GC in 
case of the required GC is not supported by VM.
Old variant:
   @requires vm.gc == null | vm.gc == "G1"
      A test will be executed if no GC is specified externally or 
-XX:+UseG1GC flag is given.
      This test will be executed even if VM doesn't support G1 and fail.
New variant:
   @requires vm.gc.G1
      This test will not be executed if VM doesn't support G1.

Testing:
1) starting jtreg with various collectors with "-c"  option to verify 
correctness of test descriptions.
     Number of selected tests before and after change is the same:
-XX:+UseG1GC:  1,456
-XX:+UseSerialGC: 1,366
-XX:+UseParallelGC: 1,369
-XX:+UseConcMarkSweepGC: 1,368
Default:  1,483; error

2) RBT (in progress)

3) Diff is analyzed manually (only necessary lines are affected):
#> hg diff |grep "^- " |sort -u
- * @requires (vm.gc == "G1" | vm.gc == "null")
- * @requires (vm.gc=="G1" | vm.gc=="null")
- * @requires vm.gc == "G1" | vm.gc == "null"
- * @requires vm.gc=="ConcMarkSweep" | vm.gc == "null"
- * @requires vm.gc=="ConcMarkSweep" | vm.gc=="null"
- * @requires vm.gc=="G1" | vm.gc =="null"
- * @requires vm.gc=="G1" | vm.gc=="null"
- * @requires vm.gc=="Parallel" | vm.gc=="null"
- * @requires vm.gc=="Serial" | vm.gc=="null"
- * @requires vm.gc=="null" | vm.gc=="G1"
- * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights 
reserved.
- * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights 
reserved.
- * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights 
reserved.
- * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
#> hg diff |grep "^+ " |sort -u
+ * @requires vm.gc.ConcMarkSweep
+ * @requires vm.gc.G1
+ * @requires vm.gc.Parallel
+ * @requires vm.gc.Serial
+ * Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights 
reserved.
+ * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights 
reserved.
+ * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights 
reserved.

Thanks,
Dima