RFR: 8301327: convert assert to guarantee in Handle_IDiv_Exception

[Afshin Zafari]

The `assert` usages are replaced with `guarantee`.

Tested tier1-4, windows-x64 and windows-x64-debug.

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Commit messages:
 - 8301327: convert assert to guarantee in Handle_IDiv_Exception

Changes: https://git.openjdk.org/jdk/pull/15945/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15945&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301327
  Stats: 7 lines in 1 file changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/15945.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15945/head:pull/15945

PR: https://git.openjdk.org/jdk/pull/15945