[10] RFR(S) 8181858: [JVMCI] JVMCI should update the trap counters when invalidating for Reason_not_compiled_exception_handler

[Christian Thalinger]

Great we got this finally fixed.  Thanks.

> On Aug 18, 2017, at 8:40 AM, Tom Rodriguez <tom.rodriguez at oracle.com> wrote:
> 
> http://cr.openjdk.java.net/~never/8181858/webrev
> https://bugs.openjdk.java.net/browse/JDK-8181858
> 
> JVMCI permits trapping when exception handlers haven't been compiled into the generated code.  When this is a normal uncommon trap the counter in the MDO is updated but when the invalidation is forced during exception dispatch the counter isn't updated.  This leads to invalidate/recompile cycles that will never terminate because the compiler doesn't know why the previous invalidation happened.  Tested with a Graal unit test https://github.com/graalvm/graal/commit/d92dc3f90c0ba1502a9e28a4faf7973ffd9a1889#diff-96a2a5e9fc63d48d47a9ef9722a7c3d9R102.
> 
> tom