early exit for dbg_value instructions

llvm-svn: 106430
diff --git a/llvm/lib/Target/ARM/ARMConstantIslandPass.cpp b/llvm/lib/Target/ARM/ARMConstantIslandPass.cpp
index 3be6d1c..4010002 100644
--- a/llvm/lib/Target/ARM/ARMConstantIslandPass.cpp
+++ b/llvm/lib/Target/ARM/ARMConstantIslandPass.cpp
@@ -492,6 +492,8 @@
     unsigned MBBSize = 0;
     for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
          I != E; ++I) {
+      if (I->isDebugValue())
+        continue;
       // Add instruction size to MBBSize.
       MBBSize += TII->GetInstSizeInBytes(I);