RFR(S): 8141585: CompilerDirectivesDCMDTest intermittently SEGVs in MethodMatcher::matcher

[Nils Eliasson]

Hi,

Please review this small fix.

Two issues where identified when investigating this crash:
1) In CompileBroker a methodHandle was not used when looking up the 
directive
2) In DirectivesStack::getMatchingDirective the directivesStack::_top 
was accessed before taking the DirectivesStack_lock

bug: https://bugs.openjdk.java.net/browse/JDK-8141585
webrev: http://cr.openjdk.java.net/~neliasso/8141585/webrev.01/

Regards,
Nils Eliasson

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