RFR: Add support of lzcnt and tzcnt

[Christian Wimmer]

>       "com.oracle.graal.replacements.amd64" : {
> -      "dependencies" : ["com.oracle.graal.replacements"],
> +      "dependencies" : [
> +          "com.oracle.graal.hotspot"
> +          ],

That adds a dependency from a VM-independent project to a HotSpot 
project - so while you can do that technically (as long as you do not 
introduce a cyclic dependency), it violates the Compiler-VM separation.

-Christain