[x86] Enable Broadwell target.
Added FeatureSMAP.

Broadwell ISA includes Haswell ISA + ADX + RDSEED + SMAP


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216161 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Broadwell: ADOX/ADCX. Added _addcarryx_u{32|64} intrinsics to LLVM.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216162 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] SMAP: added HasSMAP attribute for CLAC/STAC, corrected attributes


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216163 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Added _addcarry_ and _subborrow_ intrinsics


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216164 91177308-0d34-0410-b5e6-96231b3b80d8