[jdk21u-dev] RFR: 8326685: Linux builds not reproducible if two builds configured in different build folders

[Andrew Leonard]

Backports the debug symbol mapping fix to ensure two builds built in different build output directories are identical.

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Commit messages:
 - Backport 3b90ddfefea36d9f7f08ff11cd0cb099aa32b02b

Changes: https://git.openjdk.org/jdk21u-dev/pull/336/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=336&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326685
  Stats: 5 lines in 1 file changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/336.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/336/head:pull/336

PR: https://git.openjdk.org/jdk21u-dev/pull/336