RFR (XXS): 8146043: run JVMCI tests in JPRT

[Christian Thalinger]

https://bugs.openjdk.java.net/browse/JDK-8146043

Running all JVMCI tests on my MacBook takes about 2 minutes:

Test results: passed: 63; error: 3
Results written to /private/tmp/twisti
Error: Some tests failed or other problems occurred.

real	2m6.236s
user	4m7.922s
sys	0m14.363s

Looking at a few JPRT jobs it seems hotspot_compiler_2 takes the least amount of time currently.

diff -r 46122d93612d test/TEST.groups
--- a/test/TEST.groups	Mon Dec 21 22:17:23 2015 +0100
+++ b/test/TEST.groups	Tue Dec 22 13:02:47 2015 -1000
@@ -279,6 +279,7 @@ hotspot_compiler_2 = \
   compiler/inlining/ \
   compiler/integerArithmetic/ \
   compiler/interpreter/ \
+  compiler/jvmci/ \
   -compiler/codegen/7184394 \
   -compiler/codecache/stress