[PCH] Fix serialization of an ImportDecl.

ImportDecl's module ID was not written out and the reader accepted as module ID
the serialized:
  Record.push_back(!IdentifierLocs.empty());

llvm-svn: 165087

clang/lib/Serialization/ASTReaderDecl.cpp

@@ -1246,6 +1246,7 @@ void ASTDeclReader::VisitImportDecl(ImportDecl *D) {
   SourceLocation *StoredLocs = reinterpret_cast<SourceLocation *>(D + 1);
   for (unsigned I = 0, N = Record.back(); I != N; ++I)
     StoredLocs[I] = ReadSourceLocation(Record, Idx);
+  ++Idx; // The number of stored source locations.
 }
 
 void ASTDeclReader::VisitAccessSpecDecl(AccessSpecDecl *D) {

clang/lib/Serialization/ASTWriterDecl.cpp

@@ -984,6 +984,7 @@ void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
 
 void ASTDeclWriter::VisitImportDecl(ImportDecl *D) {
   VisitDecl(D);
+  Record.push_back(Writer.getSubmoduleID(D->getImportedModule()));
   ArrayRef<SourceLocation> IdentifierLocs = D->getIdentifierLocs();
   Record.push_back(!IdentifierLocs.empty());
   if (IdentifierLocs.empty()) {