Update wasm app build scripts for wasi-sdk-12 and refine interpreter (#481)

Update wasm app build scripts for wasi-sdk-12.0: add --export=__main_argc_argv, remove --no-threads
Lookup function with name "__main_argc_argv" as main function besides "main"
Change module_malloc to runtime_malloc in wasi native lib
Refine classic interpreter op_block and op_br_table
Refine faster interpreter op_br_table

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

product-mini/app-samples/hello-world/build.sh

@@ -3,13 +3,23 @@
 
 WAMR_DIR=${PWD}/../../..
 
-/opt/wasi-sdk/bin/clang     \
-        --target=wasm32 -O3 \
+echo "Build wasm app .."
+/opt/wasi-sdk/bin/clang -O3 \
         -z stack-size=4096 -Wl,--initial-memory=65536 \
-        --sysroot=${WAMR_DIR}/wamr-sdk/app/libc-builtin-sysroot    \
-        -Wl,--allow-undefined-file=${WAMR_DIR}/wamr-sdk/app/libc-builtin-sysroot/share/defined-symbols.txt \
-        -Wl,--export=main, \
-        -Wl,--export=__data_end, -Wl,--export=__heap_base \
-        -Wl,--no-threads,--strip-all,--no-entry \
-        -nostdlib -o test.wasm *.c
-#./jeffdump -o test_wasm.h -n wasm_test_file test.wasm
+        -o test.wasm main.c \
+        -Wl,--export=main -Wl,--export=__main_argc_argv \
+        -Wl,--export=__data_end -Wl,--export=__heap_base \
+        -Wl,--strip-all,--no-entry \
+        -Wl,--allow-undefined \
+        -nostdlib \
+
+echo "Build binarydump tool .."
+rm -fr build && mkdir build && cd build
+cmake ../../../../test-tools/binarydump-tool
+make
+cd ..
+
+echo "Generate test_wasm.h .."
+./build/binarydump -o test_wasm.h -n wasm_test_file test.wasm
+
+echo "Done"