[stubs] Add TruncationMode argument to ToInteger

src/code-stub-assembler.h

Index: src/code-stub-assembler.h
diff --git a/src/code-stub-assembler.h b/src/code-stub-assembler.h
index 39c0fe690c8a9e27a031d5f831099189edb4c0d0..6558a91411bf4c2708390cfb056676daaea877b5 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -486,8 +486,14 @@ class CodeStubAssembler : public compiler::CodeAssembler {
   // Convert any object to a Number.
   compiler::Node* ToNumber(compiler::Node* context, compiler::Node* input);
 
+  enum ToIntegerTruncationMode {
+    kNoTruncation,
+    kTruncateMinusZero,
+  };
+
   // Convert any object to an Integer.
-  compiler::Node* ToInteger(compiler::Node* context, compiler::Node* input);
+  compiler::Node* ToInteger(compiler::Node* context, compiler::Node* input,
+                            ToIntegerTruncationMode mode = kNoTruncation);
 
   // Returns a node that contains a decoded (unsigned!) value of a bit
   // field |T| in |word32|. Returns result as an uint32 node.