Check alpha-sorting of includes during presubmit.

test/cctest/test-alloc.cc

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 #include "src/v8.h"
+#include "test/cctest/cctest.h"
+
 #include "src/accessors.h"
 #include "src/api.h"
 
-#include "test/cctest/cctest.h"
-
 
 using namespace v8::internal;
 
 
 static AllocationResult AllocateAfterFailures() {
   static int attempts = 0;
 
   if (++attempts < 3) return AllocationResult::Retry();
   TestHeap* heap = CcTest::test_heap();
 
@@ skipping 186 matching lines @@
       if (index < blocks.length() - 1) {
         blocks[index] = blocks.RemoveLast();
       } else {
         blocks.RemoveLast();
       }
     }
   }
 
   code_range.TearDown();
 }