Fix comment typo.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119573 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMCodeEmitter.cpp b/lib/Target/ARM/ARMCodeEmitter.cpp
index ed3ebb7..01ca22c 100644
--- a/lib/Target/ARM/ARMCodeEmitter.cpp
+++ b/lib/Target/ARM/ARMCodeEmitter.cpp
@@ -677,7 +677,7 @@
   const TargetInstrDesc &TID = MI.getDesc();
 
   // Emit the 'add' instruction.
-  unsigned Binary = 0x4 << 21;  // add: Insts{24-31} = 0b0100
+  unsigned Binary = 0x4 << 21;  // add: Insts{24-21} = 0b0100
 
   // Set the conditional execution predicate
   Binary |= II->getPredicate(&MI) << ARMII::CondShift;