Fix signed/unsigned comparison after b5426ced71280

gcc11 warns that this counter causes a signed/unsigned comaprison when it's
later compared with a SmallVector::difference_type. gcc appears to be
correct, clang does not warn one way or the other.

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp b/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
index 32937666ea7a..1dde668c991a 100644
--- a/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
+++ b/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
@@ -2175,7 +2175,7 @@ bool InstrRefBasedLDV::vlocJoin(
     // live-out values.
     SmallVector<InValueT, 8> Values;
     bool Bail = false;
-    unsigned BackEdgesStart = 0;
+    int BackEdgesStart = 0;
     for (auto p : BlockOrders) {
       // If the predecessor isn't in scope / to be explored, we'll never be
       // able to join any locations.