RFR: 8263612: Unused variables in C1 runtime

[Frederic Parain]

Please review this small patch removing some unused variables in the C1 runtime.

Thank you,

Fred

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Commit messages:
 - Remove unused variables

Changes: https://git.openjdk.java.net/jdk/pull/3017/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3017&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263612
  Stats: 9 lines in 2 files changed: 0 ins; 9 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3017.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3017/head:pull/3017

PR: https://git.openjdk.java.net/jdk/pull/3017