RFR(sh/jdk): Fix Windows build

[rkennke at redhat.com]

CI found a little type conversion hiccup in my last change to evac-
locking. Also, one line is a duplicate.

Testing: hotspot_gc_shenandoah (sorry, no Windows build-machine at
hand)

diff -r 1bb1b0d2acce
src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.cpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.cpp  Mon Jul
06 22:43:04 2020 +0200
+++ b/src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.cpp  Tue Jul
07 14:58:30 2020 +0200
@@ -610,9 +610,8 @@
   MaxTLABSizeBytes = MaxTLABSizeWords * HeapWordSize;
   assert (MaxTLABSizeBytes > MinTLABSize, "should be larger");
 
-  size_t locking_card_size = 1 << (ShenandoahEvacLockGranularity +
LogHeapWordSize);
+  size_t locking_card_size = ((size_t)1) <<
(ShenandoahEvacLockGranularity + LogHeapWordSize);
   if (locking_card_size > RegionSizeBytes) {
-    size_t locking_card_size = 1 << (ShenandoahEvacLockGranularity +
LogHeapWordSize);
     err_msg message("Evac locking card size (" SIZE_FORMAT "%s) should
be lower than region size (" SIZE_FORMAT "%s).",
                     byte_size_in_proper_unit(locking_card_size),
proper_unit_for_byte_size(locking_card_size),
                     byte_size_in_proper_unit(RegionSizeBytes),   prope
r_unit_for_byte_size(RegionSizeBytes));
[