RFR(S): 8192971: [Testbug] LockCompilationTest fails intermittently

[Nils Eliasson]

Hi,

This patches makes a intermittently failing test robust.

With certain combinations of flags and machines this test sometimes 
doesn't compile everything in the compile queue in time. A 
slow/contented Sparc machine with -XX:-TieredCompilation in combination 
with -XX:CompileThreshold=100 fills up the compilation queue with about 
500 compilation requests before the compiler directives are added.

I am fixing this by adding the compileonly command to the commandline 
and remove the directive.

bug: https://bugs.openjdk.java.net/browse/JDK-8192971

webrev: http://cr.openjdk.java.net/~neliasso/8192971/webrev.01/

Please review,

Nils Eliasson