More inlining flags and tuned heuristics.

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
diff --git a/runtime/vm/intermediate_language.h b/runtime/vm/intermediate_language.h
index 6ce7d7542c580ea177bb57b51419f43f40d116fa..b215a687fcbffe0f09c6d29452334b28bdf6e437 100644
--- a/runtime/vm/intermediate_language.h
+++ b/runtime/vm/intermediate_language.h
@@ -667,6 +667,8 @@ class ParallelMoveInstr : public TemplateInstruction<0> {
 // branches.
 class BlockEntryInstr : public Instruction {
  public:
+  static const intptr_t kInvalidLoopDepth = -1;
+
   virtual BlockEntryInstr* AsBlockEntry() { return this; }
 
   virtual intptr_t PredecessorCount() const = 0;
@@ -747,12 +749,19 @@ class BlockEntryInstr : public Instruction {
     loop_info_ = loop_info;
   }
 
+  intptr_t loop_depth() const { return loop_depth_; }
+  void set_loop_depth(intptr_t loop_depth) {
+    ASSERT(loop_depth_ == kInvalidLoopDepth);
+    ASSERT(loop_depth != kInvalidLoopDepth);
+    loop_depth_ = loop_depth;
+  }
+
   virtual BlockEntryInstr* GetBlock() const {
     return const_cast<BlockEntryInstr*>(this);
   }
 
  protected:
-  BlockEntryInstr(intptr_t block_id, intptr_t try_index)
+  BlockEntryInstr(intptr_t block_id, intptr_t try_index, intptr_t loop_depth)
       : block_id_(block_id),
         try_index_(try_index),
         preorder_number_(-1),
@@ -761,7 +770,8 @@ class BlockEntryInstr : public Instruction {
         dominated_blocks_(1),
         last_instruction_(NULL),
         parallel_move_(NULL),
-        loop_info_(NULL) { }
+        loop_info_(NULL),
+        loop_depth_(loop_depth) { }
 
  private:
   virtual void ClearPredecessors() = 0;
@@ -788,6 +798,9 @@ class BlockEntryInstr : public Instruction {
   // preorder number.
   BitVector* loop_info_;
 
+  // Syntactic loop depth of the block.
+  intptr_t loop_depth_;
+
   DISALLOW_COPY_AND_ASSIGN(BlockEntryInstr);
 };
 
@@ -901,8 +914,8 @@ class GraphEntryInstr : public BlockEntryInstr {
 
 class JoinEntryInstr : public BlockEntryInstr {
  public:
-  JoinEntryInstr(intptr_t block_id, intptr_t try_index)
-      : BlockEntryInstr(block_id, try_index),
+  JoinEntryInstr(intptr_t block_id, intptr_t try_index, intptr_t loop_depth)
+      : BlockEntryInstr(block_id, try_index, loop_depth),
         predecessors_(2),  // Two is the assumed to be the common case.
         phis_(NULL),
         phi_count_(0) { }
@@ -971,8 +984,8 @@ class PhiIterator : public ValueObject {
 
 class TargetEntryInstr : public BlockEntryInstr {
  public:
-  TargetEntryInstr(intptr_t block_id, intptr_t try_index)
-      : BlockEntryInstr(block_id, try_index),
+  TargetEntryInstr(intptr_t block_id, intptr_t try_index, intptr_t loop_depth)
+      : BlockEntryInstr(block_id, try_index, loop_depth),
         predecessor_(NULL),
         catch_try_index_(CatchClauseNode::kInvalidTryIndex) { }