Fix typo.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18901 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile.rules b/Makefile.rules
index 7245c91..897905f 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -221,7 +221,7 @@
 LLI      := $(LLVMToolDir)/lli$(EXEEXT)
 endif
 ifndef LOPT
-LOPT     := $(LLVMToolDir)/lopt$(EXEEXT)
+LOPT     := $(LLVMToolDir)/opt$(EXEEXT)
 endif
 
 #--------------------------------------------------------------------