RFR (S) 8076987: C1 should support conditional card marks (UseCondCardMark)

[Aleksey Shipilev]

Hi,

I would like to propose a tiny enhancement in C1: handling
-XX:+UseCondCardMark. With tiered compilation enabled by default, we
need to do C1 compiles with conditional card marks as well -- otherwise
it collides with C2 compiled code that honestly does it.

RFE:
  https://bugs.openjdk.java.net/browse/JDK-8076987

Webrev:
  http://cr.openjdk.java.net/~shade/8076987/webrev.00/

Testing:
  - eyeballing benchmark assembly dumps
  - default JPRT
  - JPRT with -XX:+UseCondCardMark

Thanks,
-Aleksey

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