Check alpha-sorting of includes during presubmit.

test/cctest/test-assembler-arm.cc

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 #include "src/v8.h"
+#include "test/cctest/cctest.h"
 
+#include "src/arm/assembler-arm-inl.h"
+#include "src/arm/simulator-arm.h"
 #include "src/disassembler.h"
 #include "src/factory.h"
-#include "src/arm/simulator-arm.h"
-#include "src/arm/assembler-arm-inl.h"
-#include "test/cctest/cctest.h"
 
 using namespace v8::internal;
 
 
 // Define these function prototypes to match JSEntryFunction in execution.cc.
 typedef Object* (*F1)(int x, int p1, int p2, int p3, int p4);
 typedef Object* (*F2)(int x, int y, int p2, int p3, int p4);
 typedef Object* (*F3)(void* p0, int p1, int p2, int p3, int p4);
 typedef Object* (*F4)(void* p0, void* p1, int p2, int p3, int p4);
 
@@ skipping 1492 matching lines @@
   assm.GetCode(&desc);
   Handle<Code> code = isolate->factory()->NewCode(
       desc, Code::ComputeFlags(Code::STUB), code_object);
   F1 f = FUNCTION_CAST<F1>(code->entry());
   int res = reinterpret_cast<int>(CALL_GENERATED_CODE(f, 21, 0, 0, 0, 0));
   ::printf("f() = %d\n", res);
   CHECK_EQ(42, res);
 }
 
 #undef __