borrowck: Fix debug prints on 32-bits architectures

gcc/rust/ChangeLog:

	* checks/errors/borrowck/rust-bir-builder.h: Cast size_t values to unsigned
	long before printing.
	* checks/errors/borrowck/rust-bir-fact-collector.h: Likewise.

Author: CohenArthur

gcc/rust/checks/errors/borrowck/rust-bir-builder.h

@@ -91,7 +91,8 @@ class Builder final : public AbstractBuilder
 	  ctx.fn_free_regions[bound.second.get_index ()]);
 
 	auto last_bound = universal_region_bounds.back ();
-	rust_debug ("\t\t %ld: %ld", last_bound.first, last_bound.second);
+	rust_debug ("\t\t %lu: %lu", (unsigned long) last_bound.first,
+		    (unsigned long) last_bound.second);
       }
 
     // TODO: handle type_region constraints

gcc/rust/checks/errors/borrowck/rust-bir-fact-collector.h

@@ -621,14 +621,16 @@ class FactCollector : public Visitor
 protected: // Subset helpers.
   void push_subset (FreeRegion lhs, FreeRegion rhs)
   {
-    rust_debug ("\t\tpush_subset: '?%lu: '?%lu", lhs, rhs);
+    rust_debug ("\t\tpush_subset: '?%lu: '?%lu", (unsigned long) lhs,
+		(unsigned long) rhs);
 
     facts.subset_base.emplace_back (lhs, rhs, get_current_point_mid ());
   }
 
   void push_subset_all (FreeRegion lhs, FreeRegion rhs)
   {
-    rust_debug ("\t\tpush_subset_all: '?%lu: '?%lu", lhs, rhs);
+    rust_debug ("\t\tpush_subset_all: '?%lu: '?%lu", (unsigned long) lhs,
+		(unsigned long) rhs);
 
     for (auto point : cfg_points_all)
       facts.subset_base.emplace_back (lhs, rhs, point);