[X86] Replace the mask cmpeq/cmple/cmplt/cmpgt/cmpge/cmpneq intrinsics with macros...

[X86] Replace the mask cmpeq/cmple/cmplt/cmpgt/cmpge/cmpneq intrinsics with macros that just pass the right comparison predicate value to the regular cmp intrinsic. Remove mask cmpeq/cmpgt builtins that are now unused.

This shortens the intrinsic headers a little and allows us to get rid of the cmpeq and cmpgt handling from CGBuiltin.cpp.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@317506 91177308-0d34-0410-b5e6-96231b3b80d8