[X86] For lzcnt/tzcnt intrinsics use cttz/ctlz intrinsics with zero_undef flag set...

[X86] For lzcnt/tzcnt intrinsics use cttz/ctlz intrinsics with zero_undef flag set to false.

Previously we used a select and the zero_undef=true intrinsic. In -O2 this pattern will get optimized to zero_undef=false. But in -O0 this optimization won't happen. This results in a compare and cmov being wrapped around a tzcnt/lzcnt instruction.

By using the zero_undef=false intrinsic directly without the select, we can improve the -O0 codegen to just an lzcnt/tzcnt instruction.

Differential Revision: https://reviews.llvm.org/D52392

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@343126 91177308-0d34-0410-b5e6-96231b3b80d8