[Pipeliner] Fix an assertion caused by iterator invalidation.
diff --git a/llvm/lib/CodeGen/MachinePipeliner.cpp b/llvm/lib/CodeGen/MachinePipeliner.cpp
index 89c9f60..ef22caa 100644
--- a/llvm/lib/CodeGen/MachinePipeliner.cpp
+++ b/llvm/lib/CodeGen/MachinePipeliner.cpp
@@ -1314,8 +1314,9 @@
// Find the USEs of PHI. If the use is a PHI or REG_SEQUENCE, push back this
// SUnit to the container.
SmallVector<SUnit *, 8> UseSUs;
- for (auto I = PHISUs.begin(); I != PHISUs.end(); ++I) {
- for (auto &Dep : (*I)->Succs) {
+ // Do not use iterator based loop here as we are updating the container.
+ for (size_t Index = 0; Index < PHISUs.size(); ++Index) {
+ for (auto &Dep : PHISUs[Index]->Succs) {
if (Dep.getKind() != SDep::Data)
continue;