RFR: JDK-8300531: MSVC CFlags look suspicious [v6]

[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 incrementally with one additional commit since the last revision:

  Add -Oy-
  
  Signed-off-by: Justin King <jcking at google.com>

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/12073/files
  - new: https://git.openjdk.org/jdk/pull/12073/files/3bc1f4bb..baaaa770

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12073&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12073&range=04-05

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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