[turbofan] Fix lowering of Math.max for integral inputs.

test/unittests/compiler/js-builtin-reducer-unittest.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/js-builtin-reducer.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/typer.h"
 #include "test/unittests/compiler/graph-unittest.h"
 #include "test/unittests/compiler/node-test-utils.h"
@@ skipping 94 matching lines @@
       Node* p1 = Parameter(t1, 1);
       Node* fun = HeapConstant(Unique<HeapObject>::CreateUninitialized(f));
       Node* call = graph()->NewNode(
           javascript()->CallFunction(4, NO_CALL_FUNCTION_FLAGS), fun,
           UndefinedConstant(), p0, p1);
       Reduction r = Reduce(call);
 
       if (t0->Is(Type::Integral32()) && t1->Is(Type::Integral32())) {
         ASSERT_TRUE(r.Changed());
         EXPECT_THAT(r.replacement(),
-                    IsSelect(kMachNone, IsNumberLessThan(p1, p0), p1, p0));
+                    IsSelect(kMachNone, IsNumberLessThan(p1, p0), p0, p1));
       } else {
         ASSERT_FALSE(r.Changed());
         EXPECT_EQ(IrOpcode::kJSCallFunction, call->opcode());
       }
     }
   }
 }
 
 
 // -----------------------------------------------------------------------------
@@ skipping 41 matching lines @@
     Reduction r = Reduce(call);
 
     ASSERT_TRUE(r.Changed());
     EXPECT_THAT(r.replacement(), IsTruncateFloat64ToFloat32(p0));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8