[OpenJDK 2D-Dev] RFR: 8264666: Reuse Math.multiplyExact/addExact in the LCMSImageLayout class

[Sergey Bylokhov]

- The hand-crafted methods for addition and multiplication are replaced by the "Math" versions.
- Cleanup: the usage of do/while(false) is removed

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Commit messages:
 - delete "do{...} while (false);"
 - safeXX -> xxExact

Changes: https://git.openjdk.java.net/jdk/pull/3333/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3333&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264666
  Stats: 110 lines in 1 file changed: 5 ins; 36 del; 69 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3333.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3333/head:pull/3333

PR: https://git.openjdk.java.net/jdk/pull/3333