[jdk11u-dev] RFR: 8249087: Always initialize _body[0..1] in Symbol constructor

[Jonathan Dowland]

This change is closely related to 8247818, which we want to backport as part of getting jdk11u-dev to build with GCC >= 12.

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Depends on: https://git.openjdk.org/jdk11u-dev/pull/2451

Commit messages:
 - 8249087: Always initialize _body[0..1] in Symbol constructor

Changes: https://git.openjdk.org/jdk11u-dev/pull/2471/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2471&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8249087
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2471.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2471/head:pull/2471

PR: https://git.openjdk.org/jdk11u-dev/pull/2471