Subzero. Adds a pass for target-specific helper call generation.

src/IceTargetLoweringX86BaseImpl.h

Index: src/IceTargetLoweringX86BaseImpl.h
diff --git a/src/IceTargetLoweringX86BaseImpl.h b/src/IceTargetLoweringX86BaseImpl.h
index 739ebb5d338c69160796d452c3bc00f59dc22f78..26539252f6fa4bfae7542f46ad5a60ad2f513dd6 100644
--- a/src/IceTargetLoweringX86BaseImpl.h
+++ b/src/IceTargetLoweringX86BaseImpl.h
@@ -302,6 +302,8 @@ template <class Machine> void TargetX86Base<Machine>::staticInit() {
 template <class Machine> void TargetX86Base<Machine>::translateO2() {
   TimerMarker T(TimerStack::TT_O2, Func);
 
+  genTargetHelperCalls();
+
   // Merge Alloca instructions, and lay out the stack.
   static constexpr bool SortAndCombineAllocas = true;
   Func->processAllocas(SortAndCombineAllocas);
@@ -425,6 +427,8 @@ template <class Machine> void TargetX86Base<Machine>::translateO2() {
 template <class Machine> void TargetX86Base<Machine>::translateOm1() {
   TimerMarker T(TimerStack::TT_Om1, Func);
 
+  genTargetHelperCalls();
+
   // Do not merge Alloca instructions, and lay out the stack.
   static constexpr bool SortAndCombineAllocas = false;
   Func->processAllocas(SortAndCombineAllocas);