Integrated: 8194743: Compiler implementation for Statements before super()

[Vicente Romero]

backporting JDK-8194743 to valhalla, not a clean backport though

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Commit messages:
 - 8194743: Compiler implementation for Statements before super()

Changes: https://git.openjdk.org/valhalla/pull/981/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=981&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8194743
  Stats: 1542 lines in 29 files changed: 1155 ins; 273 del; 114 mod
  Patch: https://git.openjdk.org/valhalla/pull/981.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/981/head:pull/981

PR: https://git.openjdk.org/valhalla/pull/981