JVMCI 19.3-b06 release

[Doug Simon]

The 19.3-b06 release includes:

• GR-19906: Harmonize display of "Server VM"
• GR-19905: Fix LTS flag on JDK 11 builds
• GR-19933: -XX:-EnableJVMCI on GraalVM JDK11 fails instead of running on C2
• GR-19880: remove UseJVMCIClassLoader code from labsjdk-11
• GR-19570: VirtualObjectLayoutTest.testFormat needs to check field alignment
• GR-20027: Be more careful when getting nmethods from InstalledCode instances (JDK-8230884)
• GR-19767: HotSpot crash in Symbol::as_unicode when running native image generator (JDK-8235438)
• GR-19763: JVMCI c2v_getResolvedJavaType: VM crash (SIGSEGV) with SerialGC (#1863).

The OpenJDK based Windows, Linux and macOS binaries are mirrored at:

https://github.com/graalvm/openjdk8-jvmci-builder/releases/tag/jvmci-19.3-b06
https://github.com/graalvm/labs-openjdk-11/releases/tag/jvmci-19.3-b06

-Doug