[CodeGen] Minor correction to comment on PhysRegInfo.

[kbsmith1]

Summary

Just fixing a minor error I saw in this comment.

[dexonsmith]

LGTM.

llvm/trunk/include/llvm/CodeGen/MachineInstrBundle.h

public:
   struct PhysRegInfo {
     /// Clobbers - Reg or an overlapping register is defined, or a regmask
     /// clobbers Reg.
     bool Clobbers;
 
     /// Defines - Reg or a super-register is defined.
     bool Defines;
 
-    /// Reads - Read or a super-register is read.
+    /// Reads - Reg or a super-register is read.
     bool Reads;
 
     /// ReadsOverlap - Reg or an overlapping register is read.
     bool ReadsOverlap;
 
     /// DefinesDead - All defs of a Reg or a super-register are dead.
     bool DefinesDead;