[turbofan] Implemented the TruncateFloat32ToUint64 TurboFan operator.

src/compiler/arm64/code-generator-arm64.cc

Index: src/compiler/arm64/code-generator-arm64.cc
diff --git a/src/compiler/arm64/code-generator-arm64.cc b/src/compiler/arm64/code-generator-arm64.cc
index bfab1a670ab8f13e9ee890f9924f9af777e0b2df..809b9caf35869f72c04d4b1919ca782f56247b6a 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -1028,6 +1028,9 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
     case kArm64Float64ToInt64:
       __ Fcvtzs(i.OutputRegister64(), i.InputDoubleRegister(0));
       break;
+    case kArm64Float32ToUint64:
+      __ Fcvtzu(i.OutputRegister64(), i.InputFloat32Register(0));
+      break;
     case kArm64Float64ToUint64:
       __ Fcvtzu(i.OutputRegister64(), i.InputDoubleRegister(0));
       break;