RFR: 8283057: Update GCC to version 11.2 for Oracle builds on Linux

[Mikael Vidstedt]

Oracle is updating the version of GCC for building the JDK on Linux to 11.2. 

Testing: tier1-5 + additional significant testing. Re-running tier1,builds-tier{2,3,4,5} now for good luck.

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Commit messages:
 - gcc11.2.0

Changes: https://git.openjdk.java.net/jdk/pull/7871/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7871&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8283057
  Stats: 17 lines in 4 files changed: 9 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7871.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7871/head:pull/7871

PR: https://git.openjdk.java.net/jdk/pull/7871