23b88e8123
Previously, bitwise shifts with constant operands were validated by the checker `core.UndefinedBinaryOperatorResult`. However, this logic was unreliable, and commit 25b9696b61e53a958e217bb3d0eab66350dc187f added the dedicated checker `core.BitwiseShift` which validated the preconditions of all bitwise shifts with a more accurate logic (that uses the real types from the AST instead of the unreliable type information encoded in `APSInt` objects). This commit disables the inaccurate logic that could mark bitwise shifts as 'undefined' and removes the redundant shift-related warning messages from core.UndefinedBinaryOperatorResult. The tests that were validating this logic are also deleted by this commit; but I verified that those testcases trigger the expected bug reports from `core.BitwiseShift`. (I didn't convert them to tests of `core.BitwiseShift`, because that checker already has its own extensive test suite with many analogous testcases.) I hope that there will be a time when the constant folding will be reliable, but until then we need hacky solutions like this improve the quality of results.
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