[AMDGPU] Drop unnecessary const from a return type (NFC)

Identified with readability-const-return-type.

diff --git a/llvm/lib/Target/AMDGPU/GCNRegPressure.h b/llvm/lib/Target/AMDGPU/GCNRegPressure.h
index ba8c85a..8541c7e 100644 (file)
--- a/llvm/lib/Target/AMDGPU/GCNRegPressure.h
+++ b/llvm/lib/Target/AMDGPU/GCNRegPressure.h
@@ -160,7 +160,7 @@ class GCNDownwardRPTracker : public GCNRPTracker {
 public:
   GCNDownwardRPTracker(const LiveIntervals &LIS_) : GCNRPTracker(LIS_) {}
 
-  const MachineBasicBlock::const_iterator getNext() const { return NextMI; }
+  MachineBasicBlock::const_iterator getNext() const { return NextMI; }
 
   // Reset tracker to the point before the MI
   // filling live regs upon this point using LIS.