MIPS: [turbofan] Turn Math.clz32 into an inlinable builtin.

src/compiler/mips64/code-generator-mips64.cc

Index: src/compiler/mips64/code-generator-mips64.cc
diff --git a/src/compiler/mips64/code-generator-mips64.cc b/src/compiler/mips64/code-generator-mips64.cc
index 85b2ffb38f951ed7a1c8fd316b384a14854c5275..6131ec773c2241c3b5c1f9b307eba377cd6baab6 100644
--- a/src/compiler/mips64/code-generator-mips64.cc
+++ b/src/compiler/mips64/code-generator-mips64.cc
@@ -511,6 +511,9 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
     case kMips64Xor:
       __ Xor(i.OutputRegister(), i.InputRegister(0), i.InputOperand(1));
       break;
+    case kMips64Clz:
+      __ Clz(i.OutputRegister(), i.InputRegister(0));
+      break;
     case kMips64Shl:
       if (instr->InputAt(1)->IsRegister()) {
         __ sllv(i.OutputRegister(), i.InputRegister(0), i.InputRegister(1));