git: openjdk/jdk21: 8310656: RISC-V: __builtin___clear_cache can fail silently.

[Robbin Ehn]

Changeset: 5f1d7627
Author:    Robbin Ehn <rehn at openjdk.org>
Date:      2023-07-13 07:29:56 +0000
URL:       https://git.openjdk.org/jdk21/commit/5f1d762750a0d4c20da5b23d54f922dbb5cbbe34

8310656: RISC-V: __builtin___clear_cache can fail silently.

Reviewed-by: luhenry, fyang
Backport-of: faf1b822d03b726413d77a2b247dfbbf4db7d57e

! src/hotspot/cpu/riscv/icache_riscv.cpp
+ src/hotspot/os_cpu/linux_riscv/riscv_flush_icache.cpp
+ src/hotspot/os_cpu/linux_riscv/riscv_flush_icache.hpp