[turbofan] Add the TruncateFloat32ToInt32 operator to turbofan.

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 d356195ecfbb76075e1cd821719fcbe9bc2121b9..d394ca6773c66b73398945088b8fdc50a0b3d3df 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -1042,6 +1042,9 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
     case kArm64Float64ToFloat32:
       __ Fcvt(i.OutputDoubleRegister().S(), i.InputDoubleRegister(0));
       break;
+    case kArm64Float32ToInt32:
+      __ Fcvtzs(i.OutputRegister32(), i.InputFloat32Register(0));
+      break;
     case kArm64Float64ToInt32:
       __ Fcvtzs(i.OutputRegister32(), i.InputDoubleRegister(0));
       break;