Updated C++1y status for contextual conversions to 'partial' (without review)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183888 91177308-0d34-0410-b5e6-96231b3b80d8
Towards PR12457: constant expression evaluation support for __builtin_parity{,l,ll}, __builtin_ffs{,l,ll}, and __builtin_fpclassify.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183889 91177308-0d34-0410-b5e6-96231b3b80d8
More for PR12457: fix handling of __builtin_isinf_sign and test.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183890 91177308-0d34-0410-b5e6-96231b3b80d8