RFR: 8271616: oddPart in MutableBigInteger::mutableModInverse contains info on final result

[Weijun Wang]

oddPart contains a lot of info on the modInverse output, sometimes it's even the same. Clearing it in case the result is sensitive.

No new regression test since it's difficult to access a temporary local variable in an internal class. Existing tier1-2 tests passed.

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Commit messages:
 - 8271616: oddPart in MutableBigInteger::mutableModInverse contains info on final result

Changes: https://git.openjdk.java.net/jdk/pull/4973/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4973&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271616
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4973.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4973/head:pull/4973

PR: https://git.openjdk.java.net/jdk/pull/4973