8043723: max_heap_for_compressed_oops() declared with size_t, but defined with uintx

Summary: The mismatch in declaration and definition has been encountered when compiling on a platform where the sizes are different. Change the method definition to match the declaration.
Reviewed-by: tschatzl, sjohanss
Contributed-by: NDan Horak <dhorak@redhat.com>

src/share/vm/runtime/arguments.cpp

@@ -1401,7 +1401,7 @@ bool verify_object_alignment() {
   return true;
 }
 
-uintx Arguments::max_heap_for_compressed_oops() {
+size_t Arguments::max_heap_for_compressed_oops() {
   // Avoid sign flip.
   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
   // We need to fit both the NULL page and the heap into the memory budget, while