RFR JDK-8159720 C2 failures should not prevent C1 from compiling a method

[Carsten Varming]

Dear compiler list,

I ran into a few methods that C2 failed to compile due to their number of
arguments. To my surprise C2's failure caused the methods to be executed in
the interpreter; although they had previously been compiled with C1. It
turns out that a few C2 failures marks a method as not compilable on all
tiers. I went through all possible failures with this behavior and I don't
see reasons for preventing C1 from compiling a method after C2 failed.
Perhaps some of you know the reasons behind this. I wrote a small patch to
prevent C2 failures from marking a method as not compilable on all tiers
when tiered compilation is on.

I filed a bug: JDK-8159720
and created a webrev:
http://cr.openjdk.java.net/~cvarming/c2_failure_prevents_all_tiers/0/

Carsten
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