drop support for jdks without Integer.compare
organize imports
convert to Diamond
tidy imports
Update Creative Commons license URL in legal notices
whitespace
SCCS keyword cleansing
Put legal notices first
whitespace
Uniform headers
6394004: (coll) Thread-safety and Performance improvements to PriorityQueue
Correct @run timeouts. Avoid @run "run-ons"
Required changes for jtreg test suite integration
jtreg tests
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