RFR(XS) 8145579: SimpleThresholdPolicy assumes non-trivial methods to be trivial

[dean.long at oracle.com]

https://bugs.openjdk.java.net/browse/JDK-8145579
http://cr.openjdk.java.net/~dlong/8145579/webrev/

This change fixes certain non-trivial methods being marked as trivial.  
A method should only be marked as trivial if C2 cannot generate better 
code.  The two cases fixed here are calling intrinsics, and 
Object.<init>, which has a hidden call to register finalizers.  When run 
with http://cr.openjdk.java.net/~shade/8145579/benchmarks.jar 
<http://cr.openjdk.java.net/%7Eshade/8145579/benchmarks.jar>, the test 
methods now end up compiled at level 4 instead of level 1.

dl
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/attachments/20171204/b0187f7c/attachment.html>