AMDGPU: Use removeAllRegUnitsForPhysReg

llvm-svn: 354686
diff --git a/llvm/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp b/llvm/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
index adf23a3..0819fde 100644
--- a/llvm/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
+++ b/llvm/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
@@ -374,8 +374,7 @@
         if (!MRI.reg_empty(Reg))
           LIS->createAndComputeVirtRegInterval(Reg);
       } else {
-        for (MCRegUnitIterator U(Reg, TRI); U.isValid(); ++U)
-          LIS->removeRegUnit(*U);
+        LIS->removeAllRegUnitsForPhysReg(Reg);
       }
     }
   }