Slow compiler tests in JPRT

We noticed that after JDK-8132919 changes compiler tests execution time in JPRT greatly increased. Logs show one test take a lot of time:
compiler/c2/Test6792161.java

But it should be excluded from execution in JPRT !

The bug is missing '\' after cr8004867 - all tests after it are not excluded from execution in JPRT:

+ -compiler/c2/cr6589834 \
+ -compiler/c2/cr8004867
+ -compiler/c2/stemmer \
+ -compiler/c2/Test6792161.java \
+ -compiler/c2/Test6603011.java \
+ -compiler/c2/Test6912517.java \

Also I verified that for some reason -Xcomp Tiered JIT compilation for Test6792161.java takes a lot of time. We should switch off tiered compilation for this test.