Fix a bug when emitting cached diagnostics from nested macros. When
building a new source manager for cached diagnostics, there is a bug
when creating mapping between FileIDs between two different source
managers. If the newly created file in source manager requires another
file to be mapped, e.g. when emitting a diagnostic from nested macros,
the returning FileID can be updated by the second request before
returning. Fix the bug by making sure two different FileIDs are returned
in this case.
rdar://144810862
Use IncludeTreeFileList instead of full feature CASFS for swift
dependency filesystem. This allows smaller CAS based VFS that is smaller
and faster. This is enabled by the CAS enabled compilation does not
need to iterate file system.
rdar://136787368
Add support for swift style diagnostics for swift caching. This includes
pre-populate the GeneratedSourceInfo with macro name so it doesn't need
to infer from an ASTNode, which the caching mechanism cannot preserve.
Still leave the default diagnostic style to LLVM style because replaying
swift style diagnostics is still very slow and including parsing source
file using swift-syntax.
rdar://128615572
