Implement SIMD latest opcodes and update LLVM to 13.0 (#758)

Implement the latest SIMD opcodes and update LLVM 13.0,
update the llvm build scripts, update the sample workloads‘ build scripts,
and build customized wasi-sdk to build some workloads.
Also refine the CI rules.

Signed-off-by: Wenyong Huang <wenyong.huang@intel.com>

wamr-compiler/build_llvm_arc.sh

@@ -3,45 +3,4 @@
 # Copyright (C) 2020 Intel Corporation. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-DEPS_DIR=${PWD}/../core/deps
-
-cd ${DEPS_DIR}
-if [ ! -d "llvm" ]; then
-  echo "Clone llvm to core/deps/ .."
-  git clone https://github.com/llvm/llvm-project.git llvm
-fi
-
-cd llvm
-mkdir -p build
-cd build
-
-if [ ! -f bin/llvm-lto ]; then
-
-  CORE_NUM=$(nproc --all)
-  if [ -z "${CORE_NUM}" ]; then
-    CORE_NUM=1
-  fi
-
-  echo "Build llvm with" ${CORE_NUM} "cores"
-
-  cmake ../llvm \
-          -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
-          -DCMAKE_BUILD_TYPE:STRING="Release" \
-          -DLLVM_TARGETS_TO_BUILD:STRING="X86" \
-          -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD:STRING="ARC" \
-          -DLLVM_BUILD_LLVM_DYLIB:BOOL=OFF \
-          -DLLVM_OPTIMIZED_TABLEGEN:BOOL=ON \
-          -DLLVM_ENABLE_ZLIB:BOOL=OFF \
-          -DLLVM_INCLUDE_DOCS:BOOL=OFF \
-          -DLLVM_INCLUDE_EXAMPLES:BOOL=OFF \
-          -DLLVM_INCLUDE_TESTS:BOOL=OFF \
-          -DLLVM_INCLUDE_BENCHMARKS:BOOL=OFF \
-          -DLLVM_APPEND_VC_REV:BOOL=OFF
-  make -j ${CORE_NUM}
-
-else
-  echo "llvm has already been built"
-fi
-
-cd ${PWD}
-
+/usr/bin/env python3 ../build-scripts/build_llvm.py --platform arc