VFS: add RootedPathAndCasing This class stores a RootedPath and the String value of its relative part. This class allows distinguishing RootedPaths on case-insensitive filesystems, if two RootedPaths refer to the same file but use different casing. The motivation is to support validating package path casing. (See issue #8799.) My plan is to add a new SkyFunction called PathCasingLookupFunction, which validates that a certain RootedPath is correctly cased. The SkyKey can't just take a RootedPath, because on Windows the path semantics dictate that RootedPath objects are compared without regard to casing. Thus we must also store the particular casing in the SkyKey, and so we need the RootedPathWithCasing class. The class only compares the casing of the relative parts, not of the root parts. Reason is, this class will be used to validate the casing of package paths, which are always relative to the package root whose casing we needn't worry about. See https://github.com/bazelbuild/bazel/issues/8799 Closes #10357. Change-Id: Ie742f95a7feb3935c93cbba6db9278b63cfcc63a PiperOrigin-RevId: 283705461
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