Check alpha-sorting of includes during presubmit.

test/cctest/test-representation.cc

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+#include "test/cctest/cctest.h"
+
+#include "src/property-details.h"
 #include "src/types.h"
-#include "src/property-details.h"
-#include "test/cctest/cctest.h"
 
 using namespace v8::internal;
 
 
 void TestPairPositive(Representation more_general,
               Representation less_general) {
   CHECK(more_general.is_more_general_than(less_general));
 }
 
 
@@ skipping 78 matching lines @@
   TestPairNegative(Representation::Smi(), Representation::Integer32());
   TestPairNegative(Representation::Integer32(), Representation::Integer32());
   TestPairNegative(Representation::HeapObject(), Representation::Integer32());
   TestPairPositive(Representation::Double(), Representation::Integer32());
   TestPairPositive(Representation::Tagged(), Representation::Integer32());
 
   TestPairNegative(Representation::None(), Representation::External());
   TestPairNegative(Representation::External(), Representation::External());
   TestPairPositive(Representation::External(), Representation::None());
 }