[runtime] Port simple String.prototype.indexOf cases to TF Builtin

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 dd8769b3005f900cc7b1fdbf688801d03416e0e9..7751257a7dd8da1a5ba6157003a6394a59b18b26 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -109,7 +109,10 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
   Node* IntPtrSubFoldConstants(Node* left, Node* right);
   // Round the 32bits payload of the provided word up to the next power of two.
   Node* IntPtrRoundUpToPowerOfTwo32(Node* value);
+  // Select the maximum of the two provided IntPtr values.
   Node* IntPtrMax(Node* left, Node* right);
+  // Select the mininum of the two providede IntPtr values.

[Jakob Kummerow, 2016/12/06 06:58:40]

nit: s/num/mum/, s/dede/ded/

[Camillo Bruni, 2016/12/12 15:45:20]

;) done

+  Node* IntPtrMin(Node* left, Node* right);
 
   // Float64 operations.
   Node* Float64Ceil(Node* x);