[13] RFR(S): 8218201: Failures when vmIntrinsics::_getClass is not inlined

[Tobias Hartmann]

Hi,

please review the following patch:
https://bugs.openjdk.java.net/browse/JDK-8218201
http://cr.openjdk.java.net/~thartmann/8218201/webrev.00/

When intrinsification is disabled, the BCEscapeAnalyzer marks the return value of the (native)
method Object::getClass as "return allocated value" which means that "only newly allocated unescaped
objects are returned". The OptimizePtrCompare optimization then uses this information to incorrectly
fold 'obj.getClass() == Object.class' (see TestGetClass.java:39) to always false.

This is a very old issue and I can't trace back why a special case for the _getClass intrinsic has
been added to the BCEscapeAnalyzer. Since I don't think we should make any assumptions about the
returned Object, I've removed the special case.

Thanks,
Tobias