[SimplifyCFG] put the optional assumption cache pointer in the options struct; NFCI

This is a follow-up to https://reviews.llvm.org/D38138. 

I fixed the capitalization of some functions because we're changing those
lines anyway and that helped verify that we weren't accidentally dropping 
any options by using default param values.

llvm-svn: 314930
diff --git a/llvm/tools/bugpoint/CrashDebugger.cpp b/llvm/tools/bugpoint/CrashDebugger.cpp
index 2cd19bd..9097917 100644
--- a/llvm/tools/bugpoint/CrashDebugger.cpp
+++ b/llvm/tools/bugpoint/CrashDebugger.cpp
@@ -648,7 +648,7 @@
         ++BBIt;
         continue;
       }
-      SimplifyCFG(&*BBIt++, TTI);
+      simplifyCFG(&*BBIt++, TTI);
     }
   // Verify we didn't break anything
   std::vector<std::string> Passes;