Added SEA IR type infrastructure (and a bit of cleanup).

compiler/Android.mk: Added new files to compile.
instruction_nodes.h,
code_gen.cc: Renamed GetSSAUses to GetSSAProducers to avoid confusion
             (uses of what?).
sea.cc: Added invoke of type inference framework.
sea.h: Expose dex_file through GetDexFile().
       Added GetPositionInSIgnature() for SignatureNodes.
sea.cc: Cleanup of debug output.
visitor.h: Removed dependence on LLVM (now only in code_gen.*).
           Corrected minor typo in comment.
frontend.cc: Renamed access_flags for clarity.

Change-Id: I211d2e9ff1e0c4f910de73a52a5ac2c50e4ca7df
diff --git a/compiler/sea_ir/instruction_nodes.h b/compiler/sea_ir/instruction_nodes.h
index 6f9bddd..1b81e9a 100644
--- a/compiler/sea_ir/instruction_nodes.h
+++ b/compiler/sea_ir/instruction_nodes.h
@@ -61,7 +61,7 @@
   }
   // Returns the ordered set of Instructions that define the input operands of this instruction.
   // Precondition: SeaGraph.ConvertToSSA().
-  std::vector<InstructionNode*> GetSSAUses() {
+  std::vector<InstructionNode*> GetSSAProducers() {
     std::vector<int> uses = GetUses();
     std::vector<InstructionNode*> ssa_uses;
     for (std::vector<int>::const_iterator cit = uses.begin(); cit != uses.end(); cit++) {
@@ -70,6 +70,10 @@
     return ssa_uses;
   }
 
+  std::vector<InstructionNode*> GetSSAConsumers() {
+    return used_in_;
+  }
+
   virtual void AddSSAUse(InstructionNode* use) {
     used_in_.push_back(use);
   }