This patch adds X86 instruction itineraries for non-pseudo opcodes in

This patch adds X86 instruction itineraries for non-pseudo opcodes in
X86InstrCompiler.td.

It also adds –mcpu-generic to the legalize-shift-64.ll test so the test
will pass if run on an Intel Atom CPU, which would otherwise
produce an instruction schedule which differs from that which the test expects.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153033 91177308-0d34-0410-b5e6-96231b3b80d8