Add variable for bugpoint.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19981 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile.rules b/Makefile.rules
index 2b30928..90ae7e7 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -272,6 +272,10 @@
 ifndef LOPT
 LOPT     := $(LLVMToolDir)/opt$(EXEEXT)
 endif
+ifndef LBUGPOINT
+LBUGPOINT := $(LLVMToolDir)/bugpoint$(EXEEXT)
+endif
+
 LLVMGCCWITHPATH  := PATH="$(LLVMToolDir):$(PATH)" $(LLVMGCC)
 LLVMGXXWITHPATH  := PATH="$(LLVMToolDir):$(PATH)" $(LLVMGXX)