Bogus call to frame constructor in os_linux_x86.cpp

[Jeremy Manson]

Hi folks,

We're playing with JNI code without frame pointers, and we've come across
an interesting call to the frame constructor.  Line 193 of this file:

http://hg.openjdk.java.net/jdk8/jdk8/hotspot/file/4d37eb50b9b1/src/os_cpu/linux_x86/vm/os_linux_x86.cpp

Calls the constructor here:

http://hg.openjdk.java.net/jdk8/jdk8/hotspot/file/4d37eb50b9b1/src/cpu/x86/vm/frame_x86.inline.hpp

which triggers the assert on line 46 in a very straightforward way.  That
seems bogus.

For our tinkering, we have a workaround that avoids having
os::is_first_C_frame() fail in the first place, but surely this call
shouldn't happen?  Or the assert should be taken out?

Jeremy
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