I don't know , can't ms fab the chips at global foundry
MS cannot sell an x86 design, or at least not one with design features newer than the Pentium era.
A Bulldozer design created by AMD would have implemented an unknown number of features that are allowable by virtue of the cross-licensing agreement between Intel and AMD. AMD does not have the right to invite other companies into that agreement.
To even attempt it would have an injunction slapped on Microsoft, and AMD would lose the right to sell any modern x86 compatible chip in its product mix.
It would waste Microsoft's time and money, and it would end AMD.
Microsoft could purchase a finished product of some kind from AMD, but that would be more restrictive going forward when it comes to shrinks and design modification.