MIPS: Improve array to string conversion.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 22352e11840a2db52426f014ac8fe47a59bbe9d9..fd7af9f0f50a9f2f69a24097e875f7015ccf780a 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -1389,6 +1389,15 @@ void LCodeGen::DoDateField(LDateField* instr) {
 }
 
 
+void LCodeGen::DoSeqStringSetChar(LSeqStringSetChar* instr) {
+  SeqStringSetCharGenerator::Generate(masm(),
+                                      instr->encoding(),
+                                      ToRegister(instr->string()),
+                                      ToRegister(instr->index()),
+                                      ToRegister(instr->value()));
+}
+
+
 void LCodeGen::DoBitNotI(LBitNotI* instr) {
   Register input = ToRegister(instr->value());
   Register result = ToRegister(instr->result());