[RFR] [8u] 8236829: JDK-8232102 backport breaks s390

[Roman Kennke]

Hi Andrew,

> Bug: https://bugs.openjdk.java.net/browse/JDK-8236829
> Webrev: https://cr.openjdk.java.net/~andrew/shenandoah-8/8236829/webrev.01/
> 
> The backport of JDK-8232102 to the 8u Shenandoah port - specifically the
> use of byte_size_in_proper_unit - broke the build on s390 (31-bit). This
> is the recurring problem that size_t and uint are not the same on this
> platform.
> 
> Hence we get several format warnings such as:
> 
> /builddir/build/BUILD/java-1.8.0-openjdk-1.8.0.242.b05-0.1.ea.el7.s390/openjdk/hotspot/src/share/vm/gc_implementation/shenandoah
> /shenandoahHeapRegion.cpp: In static member function 'static void
> ShenandoahHeapRegion::setup_sizes(size_t)':
> /builddir/build/BUILD/java-1.8.0-openjdk-1.8.0.242.b05-0.1.ea.el7.s390/openjdk/hotspot/src/share/vm/gc_implementation/shenandoah
> /shenandoahHeapRegion.cpp:482:124: error: format '%zu' expects argument
> of type 'size_t', but argument 6 has type 'unsigned int'
>  [-Werror=format=]
> 
> byte_size_in_proper_unit(ShenandoahMinRegionSize),
> proper_unit_for_byte_size(ShenandoahMinRegionSize));
> 
> Forcing byte_size_in_proper_unit to use size_t, as we did before in
> https://hg.openjdk.java.net/aarch64-port/jdk8u-shenandoah/hotspot/rev/ad280373e7cc,
> fixes the problem and allowed s390 to build 8u242 b05 & b06.

Looks good, thanks!

I guess I shall forward-port this to all the way to jdk15. I've updated
the bug accordingly.

Roman