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

[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.

llvm-svn: 317506