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MIGraphX verification by default uses normalized RMS error as the basis for the verification.  This change adds some logic to allow migraphx to do "np.allclose" type of elementwise verification using atol and rtol.

Commit also includes changes to consistently pass "gold" or "expected" results as the second argument for "verify_range()" calls.  Default RMS tolerance inside driver is set to 0.001 which IMO is high for FP32 compared to what we had earlier. Need better defaults

Implements a fill operator that sets the values in an output buffer to a given value
Will be used when parsing ONNX ConstantOfShape
Can also be used when a buffer needs to be filled with a value that is determined at runtime

Re-organizes ref tests to improve the speed of compilation