Use IndexedSingleSwiftFileTestProject with -ignore-module-source-info
to force the generated interface code path. Without this, CI toolchains
(built from source) resolve String to actual stdlib source files, causing
GetReferenceDocumentRequest to receive a file:// URI instead of
sourcekit-lsp://, resulting in an "Invalid Scheme" error.
(cherry picked from commit 5c820cf61f)
Rintaro Ishizaki
bcea2462cc