[builtins] support exception handling in TFJ builtins

src/compiler/code-assembler.h

Index: src/compiler/code-assembler.h
diff --git a/src/compiler/code-assembler.h b/src/compiler/code-assembler.h
index a8e27ec9292dc2a6e3eecabb75e1d0c81193fd66..4137e5f55477e15e8c5ba49fd7da7a67e8d6304c 100644
--- a/src/compiler/code-assembler.h
+++ b/src/compiler/code-assembler.h
@@ -409,6 +409,9 @@ class CodeAssembler {
   // Branching helpers.
   void BranchIf(Node* condition, Label* if_true, Label* if_false);
 
+  void GotoIfException(Node* node, Label* if_exception,

[Michael Starzinger, 2016/08/19 18:37:43]

nit: Lets move this up one function to not have it sit in between the branching
helpers. Also maybe add a "// Exception handling support." comment.

[caitp, 2016/08/19 20:37:11]

done

+                       Variable* exception_var = nullptr);
+
 #define BRANCH_HELPER(name)                                                \
   void BranchIf##name(Node* a, Node* b, Label* if_true, Label* if_false) { \
     BranchIf(name(a, b), if_true, if_false);                               \