Add an API for clang dependency scanner to perform module lookup by name alone #3230
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…ame alone (#3127) * [clang][clang-scan-deps] Add an experimental C API for returning the list of module and file dependencies of a module for a particular compiler invocation rdar://64538073 * Address review comments - Define a subclass of FrontendAction and call loadModule there. - Remove the API for creating a worker just for clang_experimental_DependencyScannerWorkerByModName_getFileDependencies_v1. - Add the capability to get the dependencies based on the module name to clang-scan-deps. * Address review comments - Create a fake virtual source file instead of asking users to create one and pass it to the command line. - Remove the "translation-units" output from test case modules-full-by-mod-name.cpp. The information isn't useful as the source file name isn't passed on the command line in this case. - Inherit from `PreprocessOnlyAction`. * Address review comments * Address review comments - Rebase. - Rename functions. - Remove unneeded test cases. * Address review comments - Remove member `ModuleName` and thread it through functions. Remove member `FakeMemBuffer` too and make it a variable inside `computeDependencies`. - Use `MemoryBufferRef` instead of `MemoryBuffer *`. - Use `StringRef` instead of `const char *`. * Address review comments - Use Optional<String> as the type of ModuleName. - Add comments explaining what happens if the passed ModuleName isn't empty. (cherry picked from commit 2a3e8df) Conflicts: clang/tools/libclang/libclang.map
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