Fix printing of nested variable declarations with suppressed specifiers

[nick.sumner]

Summary

Allow nested variable declarations to have their types printed correctly even
when the incoming PrintingPolicy suppresses specifiers. This can happen when
initializing a variable with a statement expression. Given the C code:

int a, b = ({
    int c = 1;
    c;
});

The declaration of c is printed with a missing type specifier:

int a, b = ({
    c = 1;
    c;
});

With the patch, the declaration of c is properly printed:

int a, b = ({
    int c = 1;
    c;
});

This is related to the previous patch: http://reviews.llvm.org/D16352

lib/AST/StmtPrinter.cpp

 }
 
 void StmtPrinter::PrintRawDecl(Decl *D) {
   D->print(OS, Policy, IndentLevel);
 }
 
 void StmtPrinter::PrintRawDeclStmt(const DeclStmt *S) {
   SmallVector<Decl*, 2> Decls(S->decls());
-  Decl::printGroup(Decls.data(), Decls.size(), OS, Policy, IndentLevel);
+  PrintingPolicy SubPolicy(Policy);
+  SubPolicy.SuppressSpecifiers = false;
+  Decl::printGroup(Decls.data(), Decls.size(), OS, SubPolicy, IndentLevel);
 }
 
 void StmtPrinter::VisitNullStmt(NullStmt *Node) {
   Indent() << ";\n";
 }
 
 void StmtPrinter::VisitDeclStmt(DeclStmt *Node) {
   Indent();

test/Sema/ast-print.c

 
 // CHECK: struct pair_t p = {a: 3, .b = 4};
 struct pair_t p = {a: 3, .b = 4};
 
 void cast() {
 // CHECK: int *x = ((void *)0), *y = ((void *)0);
   int *x = ((void *)0), *y = ((void *)0);
 }
+
+void stmtExpr() {
+  int a, b = ({
+// CHECK: int c = 1;
+    int c = 1;
+    c;
+  });
+}