RFR: 8372755: Remove local suppression of VS C4146 warnings

[Kim Barrett]

Please review this trivial change to remove unnecessary local Visual Studio
warning suppressions for C4146 in HotSpot code.  JDK-8254072 intentionally
globally suppressed that warning when building HotSpot, so local suppression
is no longer needed.

Testing: mach5 tier1

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Commit messages:
 - remove local suppression of VS C4146

Changes: https://git.openjdk.org/jdk/pull/28564/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28564&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372755
  Stats: 5 lines in 2 files changed: 0 ins; 4 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/28564.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28564/head:pull/28564

PR: https://git.openjdk.org/jdk/pull/28564