8387375: Update package sun.font to use instanceof pattern variable

[gredler]

Update code in the package sun.font to make use of the instanceof pattern variable. Includes equals methods and a few methods using ClassCastException for flow control.

While looking through this code, I've noticed a few pre-existing suspicious differences between equals and hashCode implementations, but have not made any functional changes to fix this (best to address separately, if needed).

Tests checked locally on Linux, Windows and macOS:

• make test TEST="jtreg:test/jdk/java/awt/font"
• make test TEST="jtreg:test/jdk/java/awt/Graphics2D/DrawString"

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Issue

• JDK-8387375: Update package sun.font to use instanceof pattern variable (Enhancement - P4)

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