git: openjdk/jdk: 8290496: riscv: Fix build warnings-as-errors with GCC 11

[Fei Yang]

Changeset: 5425573b
Author:    Fei Yang <fyang at openjdk.org>
Date:      2022-07-20 08:26:35 +0000
URL:       https://git.openjdk.org/jdk/commit/5425573bb4de1a2434201bc7ec3700b527ce346b

8290496: riscv: Fix build warnings-as-errors with GCC 11

Reviewed-by: yadongwang, fjiang, shade

! src/hotspot/cpu/riscv/nativeInst_riscv.hpp
! src/hotspot/cpu/riscv/vtableStubs_riscv.cpp