[Polly] [PCGCodeGen] Change printf to outs() to prevent garbled output. [NFC]

[bollu]

Summary

It appears that llvm uses unbuffered C++ streams. So, we should not
mix C and C++ stream operations, because that will give us mixed
up output.

[bollu]

• remove unrelated files.

[philip.pfaffe]

Shouldn't this actually go to errs() instead?

[Meinersbur]

In D40126#927449, @philip.pfaffe wrote:

Shouldn't this actually go to errs() instead?

IMHO outs() is correct since the output was explicitly request by polly-acc-dump-code.

[philip.pfaffe]

Okay. In that case LGTM.

lib/CodeGen/PPCGCodeGeneration.cpp

public:
   ///
   /// @param Kernel The kernel to print
   void printKernel(ppcg_kernel *Kernel) {
     auto *P = isl_printer_to_str(S->getIslCtx());
     P = isl_printer_set_output_format(P, ISL_FORMAT_C);
     auto *Options = isl_ast_print_options_alloc(S->getIslCtx());
     P = isl_ast_node_print(Kernel->tree, P, Options);
     char *String = isl_printer_get_str(P);
-    printf("%s\n", String);
+    outs() << String << "\n";
     free(String);
     isl_printer_free(P);
   }
 
   /// Print C code corresponding to the GPU code described by @p Tree.
   ///
   /// @param Tree An AST describing GPU code
   /// @param PPCGProg The PPCG program from which @Tree has been constructed.
   void printGPUTree(isl_ast_node *Tree, gpu_prog *PPCGProg) {
     auto *P = isl_printer_to_str(S->getIslCtx());
     P = isl_printer_set_output_format(P, ISL_FORMAT_C);
 
     PrintGPUUserData Data;
     Data.PPCGProg = PPCGProg;
 
     auto *Options = isl_ast_print_options_alloc(S->getIslCtx());
     Options =
         isl_ast_print_options_set_print_user(Options, printHostUser, &Data);
     P = isl_ast_node_print(Tree, P, Options);
     char *String = isl_printer_get_str(P);
-    printf("# host\n");
-    printf("%s\n", String);
+    outs() << "# host\n";
+    outs() << String << "\n";
     free(String);
     isl_printer_free(P);
 
     for (auto Kernel : Data.Kernels) {
-      printf("# kernel%d\n", Kernel->id);
+      outs() << "# kernel" << Kernel->id << "\n";
       printKernel(Kernel);
     }
   }
 
   // Generate a GPU program using PPCG.
   //
   // GPU mapping consists of multiple steps:
   //
if (DumpSchedule) {
       P = isl_printer_set_yaml_style(P, ISL_YAML_STYLE_BLOCK);
       P = isl_printer_print_str(P, "Schedule\n");
       P = isl_printer_print_str(P, "========\n");
       if (Schedule)
         P = isl_printer_print_schedule(P, Schedule);
       else
         P = isl_printer_print_str(P, "No schedule found\n");
 
-      printf("%s\n", isl_printer_get_str(P));
+      outs() << isl_printer_get_str(P) << "\n";
       isl_printer_free(P);
     }
 
     if (DumpCode) {
-      printf("Code\n");
-      printf("====\n");
+      outs() << "Code\n";
+      outs() << "====\n";
       if (PPCGGen->tree)
         printGPUTree(PPCGGen->tree, PPCGProg);
       else
-        printf("No code generated\n");
+        outs() << "No code generated\n";
     }
 
     isl_schedule_free(Schedule);
 
     return PPCGGen;
   }
 
   /// Free gpu_gen structure.