Kim Barrett 28477cf493 8166188: G1 Needs pre barrier on dereference of weak JNI handles
Add low tag to jweaks and G1 barrier for jweak loads.

Co-authored-by: Martin Doerr <martin.doerr@sap.com>
Co-authored-by: Volker Simonis <volker.simonis@sap.com>
Reviewed-by: mgerdin, mdoerr, pliden, dlong, dcubed, coleenp, aph, tschatzl
2017-02-15 22:19:13 -05:00
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