Implement an abstraction to specify precise overload types supported by
DXIL ops. These overload types are typically a subset of LLVM
intrinsics.
Implement the corresponding changes in DXILEmitter backend.
Add tests to verify expected errors for unsupported overload types at
code generation time.
Add tests to check for correct overload error output.
A new pass DXILOpLowering was added.
It will scan all llvm intrinsics, create dxil op function if it can map to dxil op function.
Then translate call instructions on the intrinsic into call on dxil op function.
dxil op function will add i32 argument to the begining of args for dxil opcode.
So cannot use setCalledFunction to update the call instruction on intrinsic.
This commit only support sin to start the work.
Reviewed By: kuhar, beanz
Differential Revision: https://reviews.llvm.org/D124805
