RFR: 8275771: JDK source code contains redundant boolean operations in jdk.compiler and langtools

[Vicente Romero]

Hi,

Please review this PR which is basically rewriting some redundant boolean expressions in the compiler.

TIA

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Commit messages:
 - 8275771: JDK source code contains redundant boolean operations in jdk.compiler and langtools

Changes: https://git.openjdk.java.net/jdk/pull/6599/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6599&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275771
  Stats: 6 lines in 2 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6599.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6599/head:pull/6599

PR: https://git.openjdk.java.net/jdk/pull/6599