[jdk11u-dev] RFR: 8210689: Remove the multi-line old C style for string literals

[Goetz Lindenmaier]

I backport this for parity with 11.0.14-oracle.

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Depends on: https://git.openjdk.java.net/jdk11u-dev/pull/655

Commit messages:
 - Backport 64099fc1cc880a38aa89d4bf91745cf45643de3c

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/661/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=661&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8210689
  Stats: 390 lines in 34 files changed: 137 ins; 4 del; 249 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/661.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/661/head:pull/661

PR: https://git.openjdk.java.net/jdk11u-dev/pull/661