From cf033bb2d39c42818e3f13829b5ac6cc66b0ed6f Mon Sep 17 00:00:00 2001
From: Jeremy Morse <jeremy.morse@sony.com>
Date: Tue, 19 Oct 2021 10:24:12 +0100
Subject: [PATCH] [DebugInfo][NFC] Zero-initialize a class field

This field gets assigned when the relevant object starts being used; but it
remains uninitialized beforehand. This risks introducing hard-to-detect
bugs if something changes, so zero-initialize the field.
---
 llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.h b/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.h
index cc0a1d7..4e59db0 100644
--- a/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.h
+++ b/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.h
@@ -574,7 +574,7 @@ public:
   /// much later stage, in the TransferTracker class.
   MapVector<DebugVariable, DbgValue> Vars;
   DenseMap<DebugVariable, const DILocation *> Scopes;
-  MachineBasicBlock *MBB;
+  MachineBasicBlock *MBB = nullptr;
 
 public:
   VLocTracker() {}
-- 
2.7.4