8324125: Improve class initialization barrier in TemplateTable::_new …

…for RISC-V

Reviewed-by: fyang, rehn

src/hotspot/cpu/riscv/templateTable_riscv.cpp

@@ -3547,11 +3547,10 @@ void TemplateTable::_new() {
   // get InstanceKlass
   __ load_resolved_klass_at_offset(x14, x13, x14, t0);
 
-  // make sure klass is initialized & doesn't have finalizer
-  // make sure klass is fully initialized
-  __ lbu(t0, Address(x14, InstanceKlass::init_state_offset()));
-  __ sub(t1, t0, (u1)InstanceKlass::fully_initialized);
-  __ bnez(t1, slow_case);
+  // make sure klass is initialized
+  assert(VM_Version::supports_fast_class_init_checks(),
+         "Optimization requires support for fast class initialization checks");
+  __ clinit_barrier(x14, t0, nullptr /*L_fast_path*/, &slow_case);
 
   // get instance_size in InstanceKlass (scaled to a count of bytes)
   __ lwu(x13, Address(x14, Klass::layout_helper_offset()));