RFR: 8257236: can't use var with a class named Z

[Jan Lahoda]

To implements the local variable type inference, JShell needs to generate a few code snippets, which include an auxiliary type parameter and local variables. The name of the type parameter and variables may currently clash with names in the initializer of the variable. The proposal here is to generate a synthetic name, which won't clash with anything in the var's initializer.

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Commit messages:
 - 8257236: can't use var with a class named Z

Changes: https://git.openjdk.java.net/jdk/pull/2047/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2047&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257236
  Stats: 17 lines in 2 files changed: 12 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2047.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2047/head:pull/2047

PR: https://git.openjdk.java.net/jdk/pull/2047