[14] RFR(M) 8232904: Update JVMCI

[Vladimir Kozlov]

https://cr.openjdk.java.net/~kvn/8232904/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8232904

Sync latest changes from graal-jvmci-8:
[GR-18629] Fix compilation problem on windows.
[GR-17318] Add isBeingInitialized.
[GR-18349] Add default implementation for encoded SpeculationReasons.
[GR-17920] Handle missing or non-cloneable SHA-1 implementation.
[GR-16353] Added a getter of an address of current JavaThread into HotSpotJVMCIRuntime.

Tested with tier1, tier3-graal.

Thanks,
Vladimir