8331360: RISCV: u32 _partial_subtype_ctr loaded/stored as 64

Reviewed-by: fyang, mli, tonyp

Author: robehn

src/hotspot/cpu/riscv/macroAssembler_riscv.cpp

@@ -3344,11 +3344,7 @@ void MacroAssembler::check_klass_subtype_slow_path(Register sub_klass,
   mv(x10, super_klass);
 
 #ifndef PRODUCT
-  mv(t1, (address)&SharedRuntime::_partial_subtype_ctr);
-  Address pst_counter_addr(t1);
-  ld(t0, pst_counter_addr);
-  add(t0, t0, 1);
-  sd(t0, pst_counter_addr);
+  incrementw(ExternalAddress((address)&SharedRuntime::_partial_subtype_ctr));
 #endif // PRODUCT
 
   // We will consult the secondary-super array.

src/hotspot/cpu/riscv/stubGenerator_riscv.cpp

@@ -77,10 +77,7 @@ class StubGenerator: public StubCodeGenerator {
 #define inc_counter_np(counter) ((void)0)
 #else
   void inc_counter_np_(uint& counter) {
-    __ la(t1, ExternalAddress((address)&counter));
-    __ lwu(t0, Address(t1, 0));
-    __ addiw(t0, t0, 1);
-    __ sw(t0, Address(t1, 0));
+    __ incrementw(ExternalAddress((address)&counter));
   }
 #define inc_counter_np(counter) \
   BLOCK_COMMENT("inc_counter " #counter); \