[CodeGen][NewPM] Port `LiveVariables` to new pass manager (#97880)

- Port `LiveVariables` to new pass manager.
- Convert to `LiveVariablesWrapperPass` in legacy pass manager.

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/MachineBasicBlock.cpp b/llvm/lib/CodeGen/MachineBasicBlock.cpp
index b5c3e1625f1a..82c833ed97f5 100644
--- a/llvm/lib/CodeGen/MachineBasicBlock.cpp
+++ b/llvm/lib/CodeGen/MachineBasicBlock.cpp
@@ -1171,7 +1171,8 @@ MachineBasicBlock *MachineBasicBlock::SplitCriticalEdge(
   // On some targets like Mips, branches may kill virtual registers. Make sure
   // that LiveVariables is properly updated after updateTerminator replaces the
   // terminators.
-  LiveVariables *LV = P.getAnalysisIfAvailable<LiveVariables>();
+  auto *LVWrapper = P.getAnalysisIfAvailable<LiveVariablesWrapperPass>();
+  LiveVariables *LV = LVWrapper ? &LVWrapper->getLV() : nullptr;
 
   // Collect a list of virtual registers killed by the terminators.
   SmallVector<Register, 4> KilledRegs;