Check valid emitc float/opaque types, not float (#525)

Use the emitc-provided function to check the types instead of checking for float types, as the other arith lowering do.

Author: TinaAMD

mlir/lib/Conversion/ArithToEmitC/ArithToEmitC.cpp

@@ -84,7 +84,7 @@ class CmpFOpConversion : public OpConversionPattern<arith::CmpFOp> {
   matchAndRewrite(arith::CmpFOp op, OpAdaptor adaptor,
                   ConversionPatternRewriter &rewriter) const override {
 
-    if (!isa<FloatType>(adaptor.getRhs().getType())) {
+    if (!emitc::isFloatOrOpaqueType(adaptor.getRhs().getType())) {
       return rewriter.notifyMatchFailure(op.getLoc(),
                                          "cmpf currently only supported on "
                                          "floats, not tensors/vectors thereof");