RFR: Clean up differences against upstream

[Roman Kennke]

Yes, thanks!

Roman

> I see the post-merge differences here:
>   https://builds.shipilev.net/patch-openjdk-shenandoah-jdk/
> 
> Strdedup tests are still in quarantine, and there is a minor
> whitespace difference. I basically
> "patch -p1 -R"-ed the webrev above, omitting .hgtags change:
> 
> diff -r db8467d25e8b
> src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.hpp
> --- a/src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.hpp  Thu
> Apr 11 11:40:30 2019 +0200
> +++ b/src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.hpp  Thu
> Apr 11 12:20:10 2019 +0200
> @@ -47,4 +47,5 @@
>      ShenandoahNone,
>    };
> +
>    static bool verify_helper(Node* in, Node_Stack& phis, VectorSet&
> visited, verify_type t, bool
> trace, Unique_Node_List& barriers_used);
>    static void report_verify_failure(const char* msg, Node* n1 =
> NULL, Node* n2 = NULL);
> diff -r db8467d25e8b test/hotspot/jtreg/ProblemList.txt
> --- a/test/hotspot/jtreg/ProblemList.txt        Thu Apr 11 11:40:30
> 2019 +0200
> +++ b/test/hotspot/jtreg/ProblemList.txt        Thu Apr 11 12:20:10
> 2019 +0200
> @@ -138,11 +138,4 @@
>  ####################################################################
> #########
> 
> -# :hotspot_gc_shenandoah
> -
> -gc/shenandoah/TestStringDedup.java                            822067
> 1,8221102 generic-all
> -gc/shenandoah/TestStringDedupStress.java                      822067
> 1,8221102 generic-all
> -
> -####################################################################
> #########
> -
>  # :hotspot_misc
> 
> 
> Testing: hotspot_gc_shenandoah
>