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Essentially fix two issues in updating the index store: 1. If there was one task to index `HeaderA.h` through `main.c` and one to index `HeaderB.h` through `main.c`, we would not declare a dependency between them in the task scheduler, which meant that we could have two concurrent and racing index tasks for `main.c`. Declare a dependency between any two files that have the same main file 2. `UpdateIndexStoreTaskDescription` was computing the target to index a file in independently of `SemanticIndexManager`. While they currently always line up, we should pass the target in which to index a file to the `UpdateIndexStoreTaskDescription`. Only this way can we guarantee that we actually prepared the target that the file will be indexed in.