[CAS] Cache symbol graph outputs

The symbol graph output from a module can contain an arbitrary number of
files, depending on what extensions it contains, so cache a list of
symbol graph files with their base name and contents so that they can be
replayed.

rdar://140286819

include/swift/Basic/FileTypes.def

@@ -98,6 +98,7 @@ TYPE("swiftoverlay",        SwiftOverlayFile,          "swiftoverlay",    "")
 
 // Misc types
 TYPE("pcm",                 ClangModuleFile,           "pcm",             "")
+TYPE("symbol-graph",        SymbolGraphFile,           "symbols.json",    "")
 TYPE("pch",                 PCH,                       "pch",             "")
 TYPE("none",                Nothing,                   "",                "")
 

include/swift/Frontend/CASOutputBackends.h

@@ -46,6 +46,7 @@ public:
                         llvm::cas::ActionCache &Cache,
                         llvm::cas::ObjectRef BaseKey,
                         const FrontendInputsAndOutputs &InputsAndOutputs,
+                        const FrontendOptions &Opts,
                         FrontendOptions::ActionType Action);
   ~SwiftCASOutputBackend();
 

include/swift/Frontend/CachingUtils.h

@@ -36,7 +36,7 @@ createSwiftCachingOutputBackend(
     llvm::cas::ObjectStore &CAS, llvm::cas::ActionCache &Cache,
     llvm::cas::ObjectRef BaseKey,
     const FrontendInputsAndOutputs &InputsAndOutputs,
-    FrontendOptions::ActionType Action);
+    const FrontendOptions &Opts, FrontendOptions::ActionType Action);
 
 /// Replay the output of the compilation from cache.
 /// Return true if outputs are replayed, false otherwise.