Flow engine fixes: unreachable block processing, state merging.

src/hydrogen-check-elimination.cc

Index: src/hydrogen-check-elimination.cc
diff --git a/src/hydrogen-check-elimination.cc b/src/hydrogen-check-elimination.cc
index ae11042ba1e449b3c33b2d036ca36477165142d6..08ab675c5b85fbc2e44a6eaee2ce744b475c4474 100644
--- a/src/hydrogen-check-elimination.cc
+++ b/src/hydrogen-check-elimination.cc
@@ -117,7 +117,7 @@ class HCheckTable : public ZoneObject {
   }
 
   // Global analysis: Copy state to successor block.
-  HCheckTable* Copy(HBasicBlock* succ, Zone* zone) {
+  HCheckTable* Copy(HBasicBlock* succ, HBasicBlock* from_block, Zone* zone) {
     HCheckTable* copy = new(phase_->zone()) HCheckTable(phase_);
     for (int i = 0; i < size_; i++) {
       HCheckTableEntry* old_entry = &entries_[i];
@@ -173,7 +173,8 @@ class HCheckTable : public ZoneObject {
   }
 
   // Global analysis: Merge this state with the other incoming state.
-  HCheckTable* Merge(HBasicBlock* succ, HCheckTable* that, Zone* zone) {
+  HCheckTable* Merge(HBasicBlock* succ, HCheckTable* that,
+                     HBasicBlock* that_block, Zone* zone) {
     if (that->size_ == 0) {
       // If the other state is empty, simply reset.
       size_ = 0;