MIPS: Don't explicitly pass requested representations to constants; implement ConstantS

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 a9a4ec834236d0dc17a1720d1bb0f64563622218..5f98ee40065187b977f7eb365065c503a9b3415c 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -1500,7 +1500,11 @@ void LCodeGen::DoSubI(LSubI* instr) {
 
 
 void LCodeGen::DoConstantI(LConstantI* instr) {
-  ASSERT(instr->result()->IsRegister());
+  __ li(ToRegister(instr->result()), Operand(instr->value()));
+}
+
+
+void LCodeGen::DoConstantS(LConstantS* instr) {
   __ li(ToRegister(instr->result()), Operand(instr->value()));
 }