[turbofan] Fix Corrections tankage on x64.

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 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/code-generator.h"
 
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties-inl.h"
@@ skipping 736 matching lines @@
       // and addressing mode just happens to work out. The "addl"/"subl" forms
       // in these cases are faster based on measurements.
       if (i.InputRegister(0).is(i.OutputRegister())) {
         if (mode == kMode_MRI) {
           int32_t constant_summand = i.InputInt32(1);
           if (constant_summand > 0) {
             __ addl(i.OutputRegister(), Immediate(constant_summand));
           } else if (constant_summand < 0) {
             __ subl(i.OutputRegister(), Immediate(-constant_summand));
           }
-        } else if (mode == kMode_MR1 || mode == kMode_M2) {
-          // Using "addl %r1, %r1" is generally faster than "shll %r1, 1"
-          __ addl(i.OutputRegister(), i.InputRegister(1));
+        } else if (mode == kMode_MR1) {
+          if (i.InputRegister(1).is(i.OutputRegister())) {
+            __ shll(i.OutputRegister(), Immediate(1));
+          } else {
+            __ leal(i.OutputRegister(), i.MemoryOperand());
+          }
+        } else if (mode == kMode_M2) {
+          __ shll(i.OutputRegister(), Immediate(1));
         } else if (mode == kMode_M4) {
           __ shll(i.OutputRegister(), Immediate(2));
         } else if (mode == kMode_M8) {
           __ shll(i.OutputRegister(), Immediate(3));
         } else {
           __ leal(i.OutputRegister(), i.MemoryOperand());
         }
       } else {
         __ leal(i.OutputRegister(), i.MemoryOperand());
       }
@@ skipping 480 matching lines @@
 }
 
 
 void CodeGenerator::EnsureRelocSpaceForLazyDeopt(Handle<Code> code) {}
 
 #undef __
 
 }  // namespace internal
 }  // namespace compiler
 }  // namespace v8