RFR: JDK-8300531: MSVC CFlags look suspicious [v8]

[Justin King]

On Tue, 14 Feb 2023 18:42:07 GMT, Justin King <jcking at openjdk.org> wrote:

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

Looks like serviceability might rely on RTTI on Windows. Removed the addition of `/GR-`, which is unfortunate but necessary if serviceability relies on it.

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