Examples:
- NPP_staging.cu:1606:105: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
- NCVHaarObjectDetection.hpp:95:37: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]

Introducing boundingRect2f() (#7754)

* Introducing boundingRect2f to return exact bounding float rectangle for RotatedRect

* Introducing boundingRect2f to return exact bounding float rectangle for RotatedRect

* Introducing boundingRect2f() - update

* Introducing boundingRect2f to return exact bounding float rectangle for RotatedRect

* Introducing boundingRect2f() - update - tested

Useful for debug purposes:
    cmake -DDEBUG_POST="ocv_cmake_dump_vars(CUDA)" .
    cmake -DCMAKE_PRE="ocv_cmake_dump_vars(\"OPENCL|opencl\")" .

PCL PR 1205

This reverts commit f45da986.