[X86] Move CPU features for Barcelona/K10 out of line

[X86] Move CPU features for Barcelona/K10 out of line

Summary:
Cleans X86.td's Barcelona entry to be more like the others,
by moving the features out of the `Proc<>`, thus potentially
making it possible to inherit from them.
Split off from D63628

Reviewers: craig.topper, RKSimon

Reviewed By: craig.topper

Subscribers: hiraditya, jfb, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D65791

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@368061 91177308-0d34-0410-b5e6-96231b3b80d8