[turbofan] Initial support for Switch.

src/compiler/schedule.h

Index: src/compiler/schedule.h
diff --git a/src/compiler/schedule.h b/src/compiler/schedule.h
index a142bae0dd3f52f9a5f6b138e014b2ba28f21278..aa479851f943107c873ddf6187ddf5af2752b007 100644
--- a/src/compiler/schedule.h
+++ b/src/compiler/schedule.h
@@ -33,6 +33,7 @@ class BasicBlock FINAL : public ZoneObject {
     kNone,    // Control not initialized yet.
     kGoto,    // Goto a single successor block.
     kBranch,  // Branch if true to first successor, otherwise second.
+    kSwitch,  // Table dispatch to one of the successor blocks.
     kReturn,  // Return a value from this method.
     kThrow    // Throw an exception.
   };
@@ -233,6 +234,10 @@ class Schedule FINAL : public ZoneObject {
   void AddBranch(BasicBlock* block, Node* branch, BasicBlock* tblock,
                  BasicBlock* fblock);
 
+  // BasicBlock building: add a switch at the end of {block}.
+  void AddSwitch(BasicBlock* block, Node* sw, BasicBlock** succ_blocks,
+                 size_t succ_count);
+
   // BasicBlock building: add a return at the end of {block}.
   void AddReturn(BasicBlock* block, Node* input);
 
@@ -243,6 +248,10 @@ class Schedule FINAL : public ZoneObject {
   void InsertBranch(BasicBlock* block, BasicBlock* end, Node* branch,
                     BasicBlock* tblock, BasicBlock* fblock);
 
+  // BasicBlock mutation: insert a switch into the end of {block}.
+  void InsertSwitch(BasicBlock* block, BasicBlock* end, Node* sw,
+                    BasicBlock** succ_blocks, size_t succ_count);
+
   // Exposed publicly for testing only.
   void AddSuccessorForTesting(BasicBlock* block, BasicBlock* succ) {
     return AddSuccessor(block, succ);