RFR: 8254175: Build no-pch configuration in debug mode for submit checks

[Aleksey Shipilev]

no-pch configuration is supposed to expose missing include dependencies. But currently it runs with default (release)
bits, which misses symbols hidden in debug code. We should consider building it in debug mode.

Testing:
  - [x] GH workflow still works, see the builds in the [latest run](https://github.com/shipilev/jdk/actions/runs/293802758)

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Commit messages:
 - 8254175: Build no-pch configuration in debug mode for submit checks

Changes: https://git.openjdk.java.net/jdk/pull/547/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=547&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254175
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/547.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/547/head:pull/547

PR: https://git.openjdk.java.net/jdk/pull/547