Fix: Testing for RISC-V Zb intrinsics

Author: coastalwhite

ci/docker/riscv64gc-unknown-linux-gnu/Dockerfile

@@ -5,5 +5,5 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
         gcc-riscv64-linux-gnu libc6-dev-riscv64-cross
 
 ENV CARGO_TARGET_RISCV64GC_UNKNOWN_LINUX_GNU_LINKER=riscv64-linux-gnu-gcc \
-    CARGO_TARGET_RISCV64GC_UNKNOWN_LINUX_GNU_RUNNER="qemu-riscv64 -L /usr/riscv64-linux-gnu -cpu rv64,zk=true" \
+    CARGO_TARGET_RISCV64GC_UNKNOWN_LINUX_GNU_RUNNER="qemu-riscv64 -L /usr/riscv64-linux-gnu -cpu rv64,zk=true,zbb=true,zbc=true" \
     OBJDUMP=riscv64-linux-gnu-objdump

ci/run.sh

@@ -47,7 +47,7 @@ case ${TARGET} in
     # Some of our test dependencies use the deprecated `gcc` crates which
     # doesn't detect RISC-V compilers automatically, so do it manually here.
     riscv64*)
-        export RUSTFLAGS="${RUSTFLAGS} -Ctarget-feature=+zk"
+        export RUSTFLAGS="${RUSTFLAGS} -Ctarget-feature=+zk,+zbb,+zbc"
         export TARGET_CC="riscv64-linux-gnu-gcc"
         ;;
 esac