[parser] Push _Atomic locs through DeclaratorChunk.

Otherwise it stays uninitialized with potentially catastrophic results.
Found by afl-fuzz.

llvm-svn: 233494

clang/include/clang/Sema/DeclSpec.h

@@ -1415,7 +1415,8 @@ struct DeclaratorChunk {
   static DeclaratorChunk getPointer(unsigned TypeQuals, SourceLocation Loc,
                                     SourceLocation ConstQualLoc,
                                     SourceLocation VolatileQualLoc,
-                                    SourceLocation RestrictQualLoc) {
+                                    SourceLocation RestrictQualLoc,
+                                    SourceLocation AtomicQualLoc) {
     DeclaratorChunk I;
     I.Kind                = Pointer;
     I.Loc                 = Loc;
@@ -1423,6 +1424,7 @@ struct DeclaratorChunk {
     I.Ptr.ConstQualLoc    = ConstQualLoc.getRawEncoding();
     I.Ptr.VolatileQualLoc = VolatileQualLoc.getRawEncoding();
     I.Ptr.RestrictQualLoc = RestrictQualLoc.getRawEncoding();
+    I.Ptr.AtomicQualLoc   = AtomicQualLoc.getRawEncoding();
     I.Ptr.AttrList        = nullptr;
     return I;
   }

clang/lib/Parse/ParseDecl.cpp

@@ -4782,7 +4782,8 @@ void Parser::ParseDeclaratorInternal(Declarator &D,
       D.AddTypeInfo(DeclaratorChunk::getPointer(DS.getTypeQualifiers(), Loc,
                                                 DS.getConstSpecLoc(),
                                                 DS.getVolatileSpecLoc(),
-                                                DS.getRestrictSpecLoc()),
+                                                DS.getRestrictSpecLoc(),
+                                                DS.getAtomicSpecLoc()),
                     DS.getAttributes(),
                     SourceLocation());
     else

clang/test/Parser/atomic.c

@@ -36,3 +36,5 @@ typedef _Atomic(int __attribute__((vector_size(16)))) atomic_vector_int;
 
 struct S
 _Atomic atomic_s_no_missing_semicolon;
+
+int *const _Atomic atomic_return_type();