Enable ARM and THUMB AOT support, enable Android platform support (#182)

* Sync with internal/feature: enable arm aot and android platform

product-mini/platforms/android/build_llvm.sh

@@ -0,0 +1,43 @@
+#!/bin/sh
+
+# Copyright (C) 2019 Intel Corporation. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+DEPS_DIR=${PWD}/../../../core/deps
+
+cd ${DEPS_DIR}
+if [ ! -d "llvm" ]; then
+  echo "Clone llvm to core/deps/ .."
+  git clone https://github.com/llvm-mirror/llvm.git
+fi
+
+cd llvm
+mkdir -p build
+cd build
+
+if [ ! -f bin/llvm-lto ]; then
+
+  CORE_NUM=$(nproc --all)
+  if [ -z "${CORE_NUM}" ]; then
+    CORE_NUM=1
+  fi
+
+  echo "Build llvm with" ${CORE_NUM} "cores"
+
+  cmake .. \
+          -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
+          -DCMAKE_BUILD_TYPE:STRING="Release" \
+          -DLLVM_BUILD_LLVM_DYLIB:BOOL=OFF \
+          -DLLVM_OPTIMIZED_TABLEGEN:BOOL=ON \
+          -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}
+