[ClangImporter] Put the Swift compiler version into the module hash (#17344)

This is overkill when we could just be better about updating the
lookup table version, but it's hard to remember to do that when
changing something in ImportName.cpp or whatever.

Author: jrose-apple

lib/ClangImporter/SwiftLookupTable.cpp

@@ -1606,7 +1606,8 @@ SwiftNameLookupExtension::hashExtension(llvm::hash_code code) const {
   return llvm::hash_combine(code, StringRef("swift.lookup"),
                             SWIFT_LOOKUP_TABLE_VERSION_MAJOR,
                             SWIFT_LOOKUP_TABLE_VERSION_MINOR,
-                            inferImportAsMember);
+                            inferImportAsMember,
+                            version::getSwiftFullVersion());
 }
 
 void importer::addEntryToLookupTable(SwiftLookupTable &table,