[9] RFR(XS): 8169941: CodeBlob::is_frame_complete_at() does not honor CodeOffsets::frame_never_safe

[Tobias Hartmann]

Hi,

please review the following patch:
https://bugs.openjdk.java.net/browse/JDK-8169941
http://cr.openjdk.java.net/~thartmann/8169941/webrev.00/

CodeBlob::is_frame_complete_at() should always return false if _frame_complete_offset is set to CodeOffsets::frame_never_safe (-1). Otherwise we may crash during profiling because frame::safe_for_sender() returns true for an unsafe runtime stub frame (see JDK-8169654).

Tested with JPRT and RBT (running).

Thanks,
Tobias