sim: fix mkallsyms for Objective-C symbols on macOS

/Library/Developer/CommandLineTools/usr/bin/c++filt: error: unknown argument '-['

Signed-off-by: Peter Bee <bijunda@bytedance.com>

tools/mkallsyms.sh

@@ -64,7 +64,8 @@ if [ -f "${1}" ];then
   ${nm} -n ${1} | grep -E " [T|t] "  | uniq | \
   while read addr type name
   do
-    echo "  { \"$(${filt} $name | sed -e "s/(.*)$//")\", (FAR ${CONST} void *)0x$addr },"
+    demangled=$(printf '%s\n' "$name" | ${filt} | sed -e "s/(.*)$//")
+    echo "  { \"${demangled}\", (FAR ${CONST} void *)0x$addr },"
   done
 fi