Fix Target->Codegen dependence.

Bulk move of TargetInstrInfo implementation into
TargetInstrInfoImpl. This is dirty because the code isn't part of
TargetInstrInfoImpl class, nor should it be, because the methods are
not target hooks. However, it's the current mechanism for keeping
libTarget useful outside the backend. You'll get a not-so-nice link
error if you invoke a TargetInstrInfo method that depends on CodeGen.

The TargetInstrInfoImpl class should probably be removed since it
doesn't really solve this problem.

To really fix this, we probably need separate interfaces for the
CodeGen/nonCodeGen sides of TargetInstrInfo.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158212 91177308-0d34-0410-b5e6-96231b3b80d8

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