RFR: JDK-8305713: DocCommentParser: merge blockContent and inlineContent [v3]

[Jonathan Gibbons]

> Please review a cleanup in DocCommentParser to merge blockContent and inlineContent into a single method to parse "rich content" in a doc comment.

Jonathan Gibbons has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 59 commits:

 - Merge branch 'pr/13362' into pr/13362
 - Merge remote-tracking branch 'upstream/master' into 8305713.dcp-content
 - 8305809: (fs) Review obsolete Linux kernel dependency on os.version (Unix kernel 2.6.39)
   
   Reviewed-by: rriggs, alanb
 - 8294806: jpackaged-app ignores splash screen from jar file
   
   Reviewed-by: almatvee
 - 8305368: G1 remset chunk claiming may use relaxed memory ordering
   
   Reviewed-by: ayang, iwalulya
 - 8305370: Inconsistent use of for_young_only_phase parameter in G1 predictions
   
   Reviewed-by: iwalulya, kbarrett
 - 8305663: Wrong iteration order of pause array in g1MMUTracker
   
   Reviewed-by: ayang, tschatzl
 - 8305761: Resolve multiple definition of 'jvm' when statically linking with JDK native libraries
   
   Reviewed-by: alanb, kevinw
 - 8305419: JDK-8301995 broke building libgraal
   
   Reviewed-by: matsaave, dnsimon, thartmann
 - 8302696: Revert API signature changes made in JDK-8285504 and JDK-8285263
   
   Reviewed-by: mullan
 - ... and 49 more: https://git.openjdk.org/jdk/compare/5501bf21...45ee028b

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Changes: https://git.openjdk.org/jdk/pull/13431/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13431&range=02
  Stats: 15292 lines in 500 files changed: 7710 ins; 6358 del; 1224 mod
  Patch: https://git.openjdk.org/jdk/pull/13431.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13431/head:pull/13431

PR: https://git.openjdk.org/jdk/pull/13431