Bug #:

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Typechecking support for vectors...

- Added CheckVectorOperands(). Called from CheckAdditionOperands,
CheckMultiplyDivideOperands, CheckSubstractionOperands, and CheckBitwiseOperands.
- Added diagnostic for converting vector values of different size.
- Modified Type::isArithmeticType to include vectors.

Sould be ready for Chris to add code generation. I will continue testing/refining.

llvm-svn: 39717