Add `tosa::ConcatOp` as legal in `TosaToLinalgPass`

[ramiro050]

Summary

The lowering for tosa::ConcatOp was recently moved from
TosaToLinalg to TosaToTensor in
https://reviews.llvm.org/D145952. However, the op was not marked as
legal in the TosaToLinalgPass, resulting in legalization error when
applying TosaToLinalg to a graph with the tosa::ConcatOp.

This commit adds the op tosa::ConcatOp to the list of legal ops in
TosaToLinalgPass.

[mamrami]

it's my fault.. https://reviews.llvm.org/D145952
I just uploaded a fix because I didn't see yours:
https://reviews.llvm.org/D146213

So you can push this one and I will push the illegal in TosaToTensor

[mamrami]

There was a bug in a test in flang but it was fixed so you can push/rebase

[mamrami]

Update:
I pushed the fix and thanked you :)

[ramiro050]

Thanks, @mamrami ! I will go ahead and close this.

mlir/lib/Conversion/TosaToLinalg/TosaToLinalgPass.cpp

void runOnOperation() override {
     // Not every TOSA op can be legalized to linalg.
     target.addLegalOp<tosa::ApplyScaleOp>();
     target.addLegalOp<tosa::IfOp>();
     target.addLegalOp<tosa::ConstOp>();
     target.addLegalOp<tosa::WhileOp>();
     target.addLegalOp<tosa::SliceOp>();
     target.addLegalOp<tosa::ReshapeOp>();
     target.addLegalOp<tosa::PadOp>();
+    target.addLegalOp<tosa::ConcatOp>();
 
     target.markUnknownOpDynamicallyLegal([](Operation *) { return true; });
 
     FunctionOpInterface func = getOperation();
     mlir::tosa::populateTosaToLinalgConversionPatterns(&patterns);
     if (failed(applyFullConversion(func, target, std::move(patterns))))
       signalPassFailure();
   }