Mark the file opened by DeserializedDeclsSourceRangePrinter as a text file (#135842)
This PR will fix the following lit failure seeing on z/OS and most likely on Windows:
`FAIL: Clang :: Frontend/dump-minimization-hints.cpp`
Without `OF_TextWithCRLF` flag, a file is treated as binary and is read improperly, at least on z/OS.