[turbofan] Improve code generation for inline comparisons with zero.

src/compiler/instruction-selector.h

Index: src/compiler/instruction-selector.h
diff --git a/src/compiler/instruction-selector.h b/src/compiler/instruction-selector.h
index c4cf18bc770a9769bb32b9cb347ddc73fcb48829..cc06f10c5d9aa17b54f2abadc54f15752a10270d 100644
--- a/src/compiler/instruction-selector.h
+++ b/src/compiler/instruction-selector.h
@@ -85,20 +85,10 @@ class InstructionSelector FINAL {
     return Features(CpuFeatures::SupportedFeatures());
   }
 
-  // Checks if {node} is currently live.
-  bool IsLive(Node* node) const { return !IsDefined(node) && IsUsed(node); }
-
- private:
-  friend class OperandGenerator;
-
   // ===========================================================================
   // ============ Architecture-independent graph covering methods. =============
   // ===========================================================================
 
-  // Checks if {block} will appear directly after {current_block_} when
-  // assembling code, in which case, a fall-through can be used.
-  bool IsNextInAssemblyOrder(const BasicBlock* block) const;
-
   // Used in pattern matching during code generation.
   // Check if {node} can be covered while generating code for the current
   // instruction. A node can be covered if the {user} of the node has the only
@@ -109,13 +99,23 @@ class InstructionSelector FINAL {
   // generated for it.
   bool IsDefined(Node* node) const;
 
-  // Inform the instruction selection that {node} was just defined.
-  void MarkAsDefined(Node* node);
-
   // Checks if {node} has any uses, and therefore code has to be generated for
   // it.
   bool IsUsed(Node* node) const;
 
+  // Checks if {node} is currently live.
+  bool IsLive(Node* node) const { return !IsDefined(node) && IsUsed(node); }
+
+ private:
+  friend class OperandGenerator;
+
+  // Checks if {block} will appear directly after {current_block_} when
+  // assembling code, in which case, a fall-through can be used.
+  bool IsNextInAssemblyOrder(const BasicBlock* block) const;
+
+  // Inform the instruction selection that {node} was just defined.
+  void MarkAsDefined(Node* node);
+
   // Inform the instruction selection that {node} has at least one use and we
   // will need to generate code for it.
   void MarkAsUsed(Node* node);