[14] RFR (S): 8234923: Missed call_site_target nmethod dependency for non-fully initialized ConstantCallSite instance

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8234923/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8234923

The fix for 8234401 is incomplete: though it does notify the JVM about 
call site target update (by calling setTargetNormal [2]), on JVM side 
JITs skip nmethod dependencies for ConstantCallSites irrespective of 
whether they are fully initialized or not. So, affected nmethods aren't 
invalidated.

The fix is to make JITs aware about initialization status of 
ConstantCallSite instance by inspecting its isFrozen field and register 
proper nmethod dependency if a CallSite is being initialized.

Testing: tier1-6

Best regards,
Vladimir Ivanov

[1] 
https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2019-November/036019.html

[2] https://hg.openjdk.java.net/jdk/jdk/rev/a6e25566cb56#l1.26