<AWT Dev> RFR(XS): 8160721: Avoid deoptimizations in Font.equals.

[Lindenmaier, Goetz]

Hi,

This small fix improves performance of the C2 compiler.
We see deoptimizations due to class casts in Font.equals.
Use instanceof check instead of catching the exception.

Please review this change:
http://cr.openjdk.java.net/~goetz/wr16/8160721-deoptFont/

Best regards,
  Goetz.
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