RFR(S): 8154151: VM crashes with assert "Ensure we don't compile before compilebroker init"

[Nils Eliasson]

Hi,

Please review this fix.

Summary:
In JDK-8150646 I added an assert in compile_method that the compiler 
must not be NULL. Before there was a return there that just ignored the 
compile.

Running the VM with the flag combination -Xcomp and 
-XX:TieredStopAtLevel=0 creates a special situation: UseInterpreter is 
set to false (but the interpreter it is still available) and then some 
essential methods are forced to be compiled, but the initial complevel 
becomes 0 and hits the assert in compileBroker.

Solution:
We could discuss if it should be allowed to submit compiles on level 0, 
a change that would become a bit larger. This time I choose to extend 
the _initalized check in compile_method. I didn't add any logging or 
warning because this is really a corner case.

Bug: https://bugs.openjdk.java.net/browse/JDK-8154151
Webrev: http://cr.openjdk.java.net/~neliasso/8154151/webrev.01/
(Ignore the extra tags in the webrev)

Best regards,
Nils Eliasson
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