Unspecified type specs default to int. This fixes a crash

on test/Sema/implicit-int.c



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@39833 91177308-0d34-0410-b5e6-96231b3b80d8

Sema/SemaType.cpp

@@ -37,6 +37,7 @@ static QualType ConvertDeclSpecToType(const DeclSpec &DS, ASTContext &Ctx) {
              "Unknown TSS value");
       return Ctx.UnsignedCharTy;
     }
+  case DeclSpec::TST_unspecified:  // Unspecific typespec defaults to int.
   case DeclSpec::TST_int:
     if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) {
       switch (DS.getTypeSpecWidth()) {

test/Sema/implicit-int.c

@@ -0,0 +1,4 @@
+// RUN: clang -fsyntax-only %s
+
+foo() {
+}