MIPS64: [turbofan] Implemented the TruncateFloat64ToUint64 TurboFan operator.

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 6591fbfc9bb821d81aab2e71e81afad00b45fef2..8d010d896a0848390cf663fc4ee3d96bcfa12785 100644
--- a/src/compiler/mips64/code-generator-mips64.cc
+++ b/src/compiler/mips64/code-generator-mips64.cc
@@ -987,6 +987,12 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       __ Trunc_uw_d(i.InputDoubleRegister(0), i.OutputRegister(), scratch);
       break;
     }
+    case kMips64TruncUlD: {
+      FPURegister scratch = kScratchDoubleReg;
+      // TODO(plind): Fix wrong param order of Trunc_ul_d() macro-asm function.
+      __ Trunc_ul_d(i.InputDoubleRegister(0), i.OutputRegister(), scratch);
+      break;
+    }
     case kMips64BitcastDL:
       __ dmfc1(i.OutputRegister(), i.InputDoubleRegister(0));
       break;