MIPS: [turbofan] use Lsa/Dlsa in some Multiplication cases.

src/compiler/mips/code-generator-mips.cc

Index: src/compiler/mips/code-generator-mips.cc
diff --git a/src/compiler/mips/code-generator-mips.cc b/src/compiler/mips/code-generator-mips.cc
index 9b0d706327e95a20528b22c0ed8c4ebba32ebb50..1c4157f5eb6ad2acdddec7d997e337c5f4d62f16 100644
--- a/src/compiler/mips/code-generator-mips.cc
+++ b/src/compiler/mips/code-generator-mips.cc
@@ -869,7 +869,11 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
         __ li(i.OutputRegister(), i.InputOperand(0));
       }
       break;
-
+    case kMipsLsa:
+      DCHECK(instr->InputAt(2)->IsImmediate());
+      __ Lsa(i.OutputRegister(), i.InputRegister(0), i.InputRegister(1),
+             i.InputInt8(2));
+      break;
     case kMipsCmpS:
       // Psuedo-instruction used for FP cmp/branch. No opcode emitted here.
       break;