[jdk13u-dev] RFR: 8235846: Improve WindbgDebuggerLocal implementation

[Ekaterina Vergizova]

I'd like to backport 8235846 to 13u for parity with 11u.
The patch applies cleanly.
Tested with tier1.

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Commit messages:
 - Backport 90d656d2f6e65fa39fa090def8c346d010fd90c6

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/74/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=74&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8235846
  Stats: 484 lines in 1 file changed: 74 ins; 114 del; 296 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/74.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/74/head:pull/74

PR: https://git.openjdk.java.net/jdk13u-dev/pull/74