MC: Change RelaxInstruction to only take the input and output instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104713 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCAssembler.cpp b/lib/MC/MCAssembler.cpp
index 703f727..9c8268d 100644
--- a/lib/MC/MCAssembler.cpp
+++ b/lib/MC/MCAssembler.cpp
@@ -824,7 +824,7 @@
       // Relax the fragment.
 
       MCInst Relaxed;
-      getBackend().RelaxInstruction(IF, Relaxed);
+      getBackend().RelaxInstruction(IF->getInst(), Relaxed);
 
       // Encode the new instruction.
       //