Update Clang/LLVM toolchain to LLVM 16.0.2

Author: luismarques

azure-pipelines.yml

@@ -49,8 +49,8 @@ jobs:
         "lowrisc-toolchain-rv32imcb" \
         "riscv32-unknown-elf" \
         "/tools/riscv" \
-        "rv32imc_zba0p93_zbb0p93_zbc0p93_zbs0p93" \
-        "ilp32" "medany" "-menable-experimental-extensions"
+        "rv32imc_zba_zbb_zbc_zbs" \
+        "ilp32" "medany" ""
     displayName: "Build Clang toolchain"
     env:
       ARTIFACT_STAGING_DIR: $(Build.ArtifactStagingDirectory)

sw-versions.sh

@@ -9,7 +9,10 @@ export CROSSTOOL_NG_VERSION=5075e1f98e4329502682746cc30fa5c0c5a19d26
 # v4.0.1
 export QEMU_VERSION=23967e5b2a6c6d04b8db766a8a149f3631a7b899
 
-# LLVM 13.0.1 plus hardening patches
+# LLVM 16.0.2 plus:
+# - hardening patches
+# - unratified bitmanip extensions
+# - `.option arch` assembly directive
 export LLVM_URL=https://github.com/lowRISC/llvm-project.git
-export LLVM_BRANCH=ot-hardening
-export LLVM_VERSION=c00e0d812dc48db51d4badf93792ff363ca78ce0
+export LLVM_BRANCH=ot-llvm-16-hardening
+export LLVM_VERSION=2303c1fc6123585d334be74de0db1c7dc63c101a