8348195: More u2 conversion warnings after JDK-8347147

Reviewed-by: coleenp, dholmes

Author: shipilev

src/hotspot/share/classfile/classFileParser.cpp

@@ -2126,7 +2126,7 @@ Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
   // access_flags, name_index, descriptor_index, attributes_count
   cfs->guarantee_more(8, CHECK_NULL);
 
-  int flags = cfs->get_u2_fast();
+  u2 flags = cfs->get_u2_fast();
   const u2 name_index = cfs->get_u2_fast();
   const int cp_size = cp->length();
   guarantee_property(

src/hotspot/share/oops/fieldInfo.inline.hpp

@@ -102,7 +102,7 @@ inline void FieldInfoReader::read_field_info(FieldInfo& fi) {
   fi._name_index = checked_cast<u2>(next_uint());
   fi._signature_index = checked_cast<u2>(next_uint());
   fi._offset = next_uint();
-  fi._access_flags = AccessFlags(next_uint());
+  fi._access_flags = AccessFlags(checked_cast<u2>(next_uint()));
   fi._field_flags = FieldInfo::FieldFlags(next_uint());
   if (fi._field_flags.is_initialized()) {
     fi._initializer_index = checked_cast<u2>(next_uint());

src/hotspot/share/oops/method.cpp

@@ -1434,7 +1434,7 @@ methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid,
   cp->set_is_for_method_handle_intrinsic();
 
   // decide on access bits:  public or not?
-  int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
+  u2 flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL);
   bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid);
   if (must_be_static)  flags_bits |= JVM_ACC_STATIC;
   assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods");