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9d5f964841
Move Base64 implementation from clangd/SemanticHighlighting to llvm/Support/Base64, fix its implementation and provide a decent test suite. Previous implementation code was using + operator instead of | to combine some results, which is a problem when shifting signed values. (0xFF << 16) is implicitly converted to a (signed) int, and thus results in 0xffff0000, which is negative. Combining negative numbers with a + in that context is not what we want to do. This fixes https://github.com/llvm/llvm-project/issues/149. Differential Revision: https://reviews.llvm.org/D75057
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