RFR(M): 8248359: Update JVMCI

[Doug Simon]

Please review this webrev that ports a number of improvements to JVMCI in JDK 16 from jvmci-8 <https://github.com/graalvm/graal-jvmci-8>:

* Move C++ state and functionality associated with a HotSpotJVMCIRuntime Java object into its peer JVMCIRuntime C++ object (e.g., the _shared_library_javavm moves from being a static field in JVMCIEnv to an instance field in JVMCIRuntime).
* The management of JNI globals handles and Metadata handles passed to JVMCI Java code should also be moved to JVMCIRuntime.
* Introduce tracing of low frequency JVMCIRuntime lifetime events (e.g. JVMCIRuntime lifetime phase events) at less verbose trace level.
* Trace high frequency JVMCI events (e.g. CompilerToVM calls) at more verbose trace level.
* Detect unsupported jvmci.* system properties and use fuzzy matching for an error message suggesting closely matching supported properties.
* Improve javadoc for HotSpotJVMCIRuntime.attachCurrentThread.
* Reduce calls to JavaThread::current() in conjunction with JNIAccessMark.

https://bugs.openjdk.java.net/browse/JDK-8248359
https://dougxc.github.io/webrevs/8248359_16.01

Testing: hs-tier1,hs-tier2,hs-tier3-graal

-Doug