[ndk] Fix the possible unwind loop.

The function with both uwtable and noreturn may result in infinite
loop at runtime.  This is because [can't unwind] was not marked when
the function have both uwtable and nounwind.  Besides, the
optimization pass will not save the link register if the function has
the nounwind attribute.

Change-Id: I6ce8bf398dc9aa67f8aa11178c37e477fd9e2fd3