RFR: 7062: Update to the Eclipse 2020-12 platform [v2]

[Marcus Hirt]

> Also updating the babel bundles for the 2020-09 platform.

Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:

  Use 2020-09 as default until problems resolved

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/185/files
  - new: https://git.openjdk.java.net/jmc/pull/185/files/496efe11..3e791d41

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=185&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=185&range=00-01

  Stats: 6 lines in 1 file changed: 3 ins; 3 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/185.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/185/head:pull/185

PR: https://git.openjdk.java.net/jmc/pull/185