Revert the vector part of Enrico's change in r198729;
it is causing an llvm assert when run against
test/functionalities/data-formatter/rdar-10642615,

Assertion failed: (isa<X>(Val) && "cast<Ty>() argument of incompatible type!"), function cast, file llvm/include/llvm/Support/Casting.h, line 239.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@198809 91177308-0d34-0410-b5e6-96231b3b80d8