-Remove Sema::ActOnCastOfParenListExpr and move most of its functionality to

-Remove Sema::ActOnCastOfParenListExpr and move most of its functionality to
 newly introduced Sema::BuildVectorLiteral.
-Make Sema::ActOnCastExpr handle a vector initializer both when the cast'ed expression
 is a ParenListExpr and when it is a ParenExpr.
-Ultimately make Sema::ActOnParenOrParenListExpr independent of what the cast type was.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@134274 91177308-0d34-0410-b5e6-96231b3b80d8