8177290: add copy factory methods for unmodifiable List, Set, Map 8184690: add Collectors for collecting into unmodifiable List, Set, and Map Reviewed-by: alanb, briangoetz, dholmes, jrose, rriggs, scolebourne

8192995: run-test gtest should use all jvm variants, not just "server" Reviewed-by: erikj

8146977: Move the output "Building configuration X (matching Y)" to lower log level Reviewed-by: erikj

8175795: configure should verify that system zlib contains needed functionality Reviewed-by: erikj

8192854: FONTCONFIG_CFLAGS missing from spec.gmk.in Reviewed-by: erikj, prr

8189749: Devise strategy for making source level checks more uniform Summary: Create a 'feature' enum which is responsible for handling source version checks and related diagnostic generation Reviewed-by: jjg, jlahoda

8192961: Remove some double semicolons Reviewed-by: redestad

8191955: AArch64: incorrect prefetch distance causes an internal error Summary: Fixed incorrect prefetch distance on AArch64. Reviewed-by: aph

8190843: can not set/get extendedOptions to ServerSocket Reviewed-by: chegar, rriggs

8187985: Broken certificate number in debug output Reviewed-by: weijun

8187497: Redundant variable assignment in Java_sun_security_jgss_wrapper_GSSLibStub_getMic Reviewed-by: wetmore

8191069: Miscellaneous changes imported from jsr166 CVS 2017-12 Reviewed-by: martin, psandoz

8187947: A race condition in SubmissionPublisher Reviewed-by: martin, psandoz

8191937: Lost interrupt in AbstractQueuedSynchronizer when tryAcquire methods throw Reviewed-by: martin, psandoz

8191918: tomcat gzip-compressed response bodies appear to be broken in update 151 Reviewed-by: psandoz

8186961: Class.getFields() does not return fields of previously visited super interfaces/classes. Reviewed-by: mchung, redestad