[turbofan] Fix ArchStackPointer properties for instruction scheduling.

src/compiler/instruction-scheduler.cc

Index: src/compiler/instruction-scheduler.cc
diff --git a/src/compiler/instruction-scheduler.cc b/src/compiler/instruction-scheduler.cc
index 829e883f49a20f12d006df43d0678c1748a4030a..9f7f9cac88c29f45cc00c0a89bee657c4ad6a2e6 100644
--- a/src/compiler/instruction-scheduler.cc
+++ b/src/compiler/instruction-scheduler.cc
@@ -172,13 +172,17 @@ void InstructionScheduler::ScheduleBlock() {
 int InstructionScheduler::GetInstructionFlags(const Instruction* instr) const {
   switch (instr->arch_opcode()) {
     case kArchNop:
-    case kArchStackPointer:
     case kArchFramePointer:
     case kArchParentFramePointer:
     case kArchTruncateDoubleToI:
     case kArchStackSlot:
       return kNoOpcodeFlags;
 
+    case kArchStackPointer:
+      // ArchStackPointer instruction loads the current stack pointer value and
+      // must not be reordered with instruction with side effects.
+      return kIsLoadOperation;
+
     case kArchPrepareCallCFunction:
     case kArchPrepareTailCall:
     case kArchCallCFunction: