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b2528fc490
This patch changes how the dependency scanner creates the fake input file when scanning dependencies of a single module (introduced in D109485). The scanner now has its own `InMemoryFilesystem` which sits under the minimizing FS (when that's requested). This makes it possible to drop the duplicate work in `DependencyScanningActions::runInvocation` that sets up the main file ID. Besides that, this patch makes it possible to land D108979, where we drop `ClangTool` entirely. Depends on D109485. Reviewed By: dexonsmith Differential Revision: https://reviews.llvm.org/D109498