8349851: RISC-V: Call VM leaf can use movptr2

Reviewed-by: fyang, mli

Author: robehn

src/hotspot/cpu/riscv/macroAssembler_riscv.cpp

@@ -793,7 +793,7 @@ void MacroAssembler::call_VM_leaf_base(address entry_point,
                                        Label *retaddr) {
   int32_t offset = 0;
   push_reg(RegSet::of(t1, xmethod), sp);   // push << t1 & xmethod >> to sp
-  mv(t1, entry_point, offset);
+  movptr(t1, entry_point, offset, t0);
   jalr(t1, offset);
   if (retaddr != nullptr) {
     bind(*retaddr);