Break false dependencies for POPCNT, LZCNT, TZCNT

Add POPCNT, LZCNT, TZCNT to the list of instructions that have false dependency.
Add a test to make sure BreakFalseDeps breaks the dependencies for these instructions.
Update affected tests.

This fixes bugzilla https://bugs.llvm.org/show_bug.cgi?id=33869

This is the final of multiple patches that fix this bugzilla.
Most of the patches are intended at refactoring the existent code.

Reviews of the refactoring done to enable this change:
https://reviews.llvm.org/D40330
https://reviews.llvm.org/D40331
https://reviews.llvm.org/D40332
https://reviews.llvm.org/D40333

Differential Revision: https://reviews.llvm.org/D40334

Change-Id: If95cbf1a3f5c7dccff8f1b22ecb397542147303d
llvm-svn: 323096