RFR: JDK-8303166: Disable RTTI for Hotspot when building with MSVC [v2]

[Justin King]

> Disable RTTI `-GR-` for Hotspot when building with MSVC. This drops the size of `jvm.dll` by roughly 1 MB. Hotspot does not rely on RTTI and it is disabled for both GCC/Clang and Open XL C/C++ already. This change disables it for MSVC, ensuring we do not accidently rely on RTTI for Windows-specific code while also decreasing the resulting binary size.
> 
> Cheers to @alexmenkov for finding the tricky root cause of why disabling RTTI was causing a subset of serviceability agent tests to fail.

Justin King has updated the pull request incrementally with one additional commit since the last revision:

  Update src/hotspot/share/runtime/notificationThread.hpp
  
  Co-authored-by: Chris Plummer <chris.plummer at oracle.com>

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12743/files
  - new: https://git.openjdk.org/jdk/pull/12743/files/87d707eb..9a882207

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12743&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12743&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12743.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12743/head:pull/12743

PR: https://git.openjdk.org/jdk/pull/12743