8307150: RISC-V: Remove remaining StoreLoad barrier with UseCondCardMark for Serial/Parallel GC

Reviewed-by: fyang
Backport-of: 0b5b6429a080c6526daeb262fee96e7d0408b4f8

Author: feilongjiang

src/hotspot/cpu/riscv/gc/shared/cardTableBarrierSetAssembler_riscv.cpp

@@ -49,7 +49,6 @@ void CardTableBarrierSetAssembler::store_check(MacroAssembler* masm, Register ob
 
   if (UseCondCardMark) {
     Label L_already_dirty;
-    __ membar(MacroAssembler::StoreLoad);
     __ lbu(t1,  Address(tmp));
     __ beqz(t1, L_already_dirty);
     __ sb(zr, Address(tmp));