Improve array to string conversion.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index de60451510df133f2f5321f7cf86903322ba4a90..55d7151bdad7063aa6ca28a7168cb840445cde6d 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -1550,6 +1550,15 @@ void LCodeGen::DoDateField(LDateField* instr) {
 }
 
 
+void LCodeGen::DoSeqStringSetChar(LSeqStringSetChar* instr) {
+  Register string = ToRegister(instr->string());
+  Register index = ToRegister(instr->index());
+  Register value = ToRegister(instr->value());
+  SeqStringSetCharGenerator::Generate(
+      masm(), instr->is_one_byte(), string, index, value);
+}
+
+
 void LCodeGen::DoBitNotI(LBitNotI* instr) {
   LOperand* input = instr->value();
   ASSERT(input->Equals(instr->result()));