Integrated: Merge lworld

[Vicente Romero]

Merge branch 'lworld' into lw5

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Commit messages:
 - Merge branch 'lworld' into merge.with.lworld
 - Merge jdk
 - 8310512: Cleanup indentation in jfc files
 - 8310575: no `@since` for StandardDoclet
 - 8310384: Add hooks for custom image creation
 - 8309883: no `@since` info in com.sun.tools.javac package-info.java, Main.java
 - 8310332: Fix -Wconversion warnings in MethodData
 - 8310379: Relax prerequisites for java.base-jmod target
 - 8310335: JFR: Modernize collections and switch statements
 - 8264899: C1: -XX:AbortVMOnException does not work if all methods in the call stack are compiled with C1 and there are no exception handlers
 - ... and 174 more: https://git.openjdk.org/valhalla/compare/05f62bbd...200b3e79

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lw5: https://webrevs.openjdk.org/?repo=valhalla&pr=902&range=00.0
 - lworld: https://webrevs.openjdk.org/?repo=valhalla&pr=902&range=00.1

Changes: https://git.openjdk.org/valhalla/pull/902/files
  Stats: 34428 lines in 1156 files changed: 18379 ins; 10866 del; 5183 mod
  Patch: https://git.openjdk.org/valhalla/pull/902.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/902/head:pull/902

PR: https://git.openjdk.org/valhalla/pull/902