8314119: G1: Fix -Wconversion warnings in G1CardSetInlinePtr::card_pos_for

Reviewed-by: tschatzl, kbarrett

Author: albertnetymk

src/hotspot/share/gc/g1/g1CardSetContainers.hpp

@@ -78,7 +78,7 @@ class G1CardSetInlinePtr : public StackObj {
 
   static const uintptr_t SizeFieldMask = (((uint)1 << SizeFieldLen) - 1) << SizeFieldPos;
 
-  static uint8_t card_pos_for(uint const idx, uint const bits_per_card) {
+  static uint card_pos_for(uint const idx, uint const bits_per_card) {
     return (idx * bits_per_card + HeaderSize);
   }
 

src/hotspot/share/gc/g1/g1CardSetContainers.inline.hpp

@@ -35,7 +35,7 @@ inline G1CardSetInlinePtr::ContainerPtr G1CardSetInlinePtr::merge(ContainerPtr o
   assert((idx & (SizeFieldMask >> SizeFieldPos)) == idx, "Index %u too large to fit into size field", idx);
   assert(card_in_region < ((uint)1 << bits_per_card), "Card %u too large to fit into card value field", card_in_region);
 
-  uint8_t card_pos = card_pos_for(idx, bits_per_card);
+  uint card_pos = card_pos_for(idx, bits_per_card);
   assert(card_pos + bits_per_card < BitsInValue, "Putting card at pos %u with %u bits would extend beyond pointer", card_pos, bits_per_card);
 
   // Check that we do not touch any fields we do not own.