Fix typo in comment

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256798 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/MachineInstrBundle.h

@@ -178,7 +178,7 @@ public:
     /// register.
     bool FullyDefined;
 
-    /// Reg or ont of its aliases is read. The register may only be read
+    /// Reg or one of its aliases is read. The register may only be read
     /// partially.
     bool Read;
     /// Reg or a super-register is read. The full register is read.