Enhance the 'Vectors and Extended Vectors' section.

Added cast operations to the table of vector operations. Supported status 'no' means that there are no tests in the Clang test suite for the given cast.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@217055 91177308-0d34-0410-b5e6-96231b3b80d8