RFR: 8262227: Change SystemDictionary::find() to return an InstanceKlass*.

[Ioi Lam]

On Wed, 24 Feb 2021 19:32:29 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

> Please review this fix for JDK-8262227.  This fix changes SystemDictionary::find() to return an InstanceKlass* to reduce InstanceKlass casts, it renames find() to find_instance_klass(), removes its unneeded TRAP parameter, and changes its callers as appropriate.
> 
> It also changed the get_java_...() methods, in thread.cpp, to take an InstanceKlass* parameter and removed their now unneeded TRAPS parameter.
> 
> The fix was tested with mach5 tiers 1 and 2 on Linux, Windows, and Mac OS, and tiers 3-5 on Linux x64 (still in progress).
> 
> Thanks to Coleen and David for their helpful suggestions.
> 
> Thanks, Harold

Marked as reviewed by iklam (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/2712