Fix typo in comment

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297742 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Artyom Skrobov

lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp

@@ -741,7 +741,7 @@ void ARMAsmBackend::processFixupValue(const MCAssembler &Asm,
 
   // Try to get the encoded value for the fixup as-if we're mapping it into
   // the instruction. This allows adjustFixupValue() to issue a diagnostic
-  // if the value aren't invalid.
+  // if the value is invalid.
   (void)adjustFixupValue(Fixup, Value, false, &Asm.getContext(),
                          IsLittleEndian, IsResolved);
 }