Check alpha-sorting of includes during presubmit.

test/cctest/test-parsing.cc

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+#include <stdio.h>
 #include <stdlib.h>
-#include <stdio.h>
 #include <string.h>
 
 #include "src/v8.h"
 
 #include "src/compiler.h"
 #include "src/execution.h"
 #include "src/isolate.h"
 #include "src/objects.h"
 #include "src/parser.h"
 #include "src/preparser.h"
@@ skipping 2500 matching lines @@
   v8::Local<v8::String> source =
       v8::String::NewFromTwoByte(isolate, two_byte_source);
   v8::Local<v8::Value> result = CompileRun(source);
   CHECK(result->IsString());
   v8::Local<v8::String> expected_name =
       v8::String::NewFromTwoByte(isolate, two_byte_name);
   CHECK(result->Equals(expected_name));
   i::DeleteArray(two_byte_source);
   i::DeleteArray(two_byte_name);
 }