[jdk11u-dev] RFR: 8211148: var in implicit lambdas shouldn't be accepted for source < 11

[Goetz Lindenmaier]

I would like to backport this to jdk11u-dev. 

Applies clean except for trivial context resolve in Source.java

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Commit messages:
 - Backport 2589e9733e054c164a64112db80e25fefd6dd222

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/497/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=497&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8211148
  Stats: 49 lines in 6 files changed: 22 ins; 7 del; 20 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/497.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/497/head:pull/497

PR: https://git.openjdk.java.net/jdk11u-dev/pull/497