Ignore oatdata and oatexec symbols more widely

These are artifical symbols inside android oat files without any value
for the user while causing a significant perfoamce hit inside the
unwinder. We were already ignoring it inside system@framework@boot.oat
bot they have to be ignored in every oat file. Considering that oat
files are only used on android this have no effect on any other
platfrom.

llvm-svn: 274500