RFR: 8367130: JDK builds broken by 8366837: Clean up gensrc by spp.Spp

[Erik Joelsson]

Builds on all platforms are currently broken due to a clash between [JDK-8366837](https://bugs.openjdk.org/browse/JDK-8366837) and [JDK-8366455](https://bugs.openjdk.org/browse/JDK-8366455).  The former changed the name of a variable that the latter introduced a new usage of. The fix is simple, just change the usage of the variable to the new name.

I'm running a quick verification in internal CI.

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Commit messages:
 - JDK-8367130

Changes: https://git.openjdk.org/jdk/pull/27150/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27150&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367130
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/27150.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27150/head:pull/27150

PR: https://git.openjdk.org/jdk/pull/27150