Remove spurious consts. This fixes warnings with compilers that
are strict about such things.

llvm-svn: 41956
diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp
index 8a59231..d6aab29 100644
--- a/llvm/lib/CodeGen/MachineInstr.cpp
+++ b/llvm/lib/CodeGen/MachineInstr.cpp
@@ -116,7 +116,7 @@
 
 /// getOpcode - Returns the opcode of this MachineInstr.
 ///
-const int MachineInstr::getOpcode() const {
+int MachineInstr::getOpcode() const {
   return TID->Opcode;
 }