RFR: 8373593: Support latest VS2026 MSC_VER in abstract_vm_version.cpp

[Matthias Baesken]

VS2026 has been released recently and support in the OpenJDK build has been introduced with [JDK-8371967](https://bugs.openjdk.org/browse/JDK-8371967). The compiler has a new `_MSC_VER = 1950 ` which should be covered in abstract_vm_version.cpp .

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

Commit messages:
 - JDK-8373593

Changes: https://git.openjdk.org/jdk/pull/28792/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28792&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373593
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28792.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28792/head:pull/28792

PR: https://git.openjdk.org/jdk/pull/28792