RFR: JDK-8300531: MSVC CFlags look suspicious [v4]

[Justin King]

> Update MSVC CFlags to be more consistent with other compilers. Also disables RTTI in a simliar manner to GCC/Clang for the JVM.

Justin King has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:

  Update MSVC CFlags
  
  Signed-off-by: Justin King <jcking at google.com>

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Changes: https://git.openjdk.org/jdk/pull/12073/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12073&range=03
  Stats: 13 lines in 1 file changed: 6 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/12073.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12073/head:pull/12073

PR: https://git.openjdk.org/jdk/pull/12073