[Bug java/21856] null pointer check elimination

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21856

Bug 21856 depends on bug 20318, which changed state.

Bug 20318 Summary: RFE: add attribute to specify that a function never returns NULL
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20318

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED