Fix a -Wparentheses warning from GCC that caught a badly formed assert.

I have no idea why Clang's warning doesn't fire here, looks like a Clang
bug. I'll investigate that separately.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@198677 91177308-0d34-0410-b5e6-96231b3b80d8
For areVectorOperandsLaxBitCastable(), only return false if both opearands are vector types
and add a diagnostic when the operand is a vector and non-scalar value.

rdar://15722301

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@198680 91177308-0d34-0410-b5e6-96231b3b80d8
Sort all the #include lines with LLVM's utils/sort_includes.py which
encodes the canonical rules for LLVM's style. I noticed this had drifted
quite a bit when cleaning up LLVM, so wanted to clean up Clang as well.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@198686 91177308-0d34-0410-b5e6-96231b3b80d8
Update Clang for the move of headers in r198688.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@198689 91177308-0d34-0410-b5e6-96231b3b80d8