RFR: Fix ExtendedDTraceProbes with Shenandoah

[Aleksey Shipilev]

On 09/21/2018 09:13 AM, Roman Kennke wrote:
> The interesting question is: is this reproducible with upstream+G1
> somehow? Can you make a testcase against G1, and fix it upstream?
> 
> Also, might we have more 'hidden-ctrl-flow-bugs' lurking in our code?

And on top of that, is there a way to mechanically check there is no control flow within the C1 BB?
This sounds like a serious trouble that needs to be asserted by the compiler itself.

-Aleksey