[Bug target/59422] New: Support more targets for function multi versioning

[linux at carewolf dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59422

            Bug ID: 59422
           Summary: Support more targets for function multi versioning
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: linux at carewolf dot com

Created attachment 31399
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31399&action=edit
Patch

Trying to compile a function with an "xop" multiversion fails with a "No
dispatcher found for xop" error message. Similarly newer x86 architectures are
not detected. 

Patch attached. 

Adds support for haswell, silvermount, and the most recent amd models. It also
prioritizes AVX2 versions over AMD specific version pre-AVX2.