8322154: RISC-V: JDK-8315743 missed change in MacroAssembler::load_reserved

Reviewed-by: fyang, rehn, luhenry

Author: zifeihan

src/hotspot/cpu/riscv/macroAssembler_riscv.cpp

@@ -2771,7 +2771,7 @@ void MacroAssembler::load_reserved(Register dst,
       break;
     case uint32:
       lr_w(dst, addr, acquire);
-      zero_extend(t0, t0, 32);
+      zero_extend(dst, dst, 32);
       break;
     default:
       ShouldNotReachHere();