verify-uselistorder: Change the default -num-shuffles=5

Change the default for `-num-shuffles` to 5 and better document the
algorithm in the header docs of `verify-uselistorder`.

llvm-svn: 214419
diff --git a/llvm/test/Bitcode/conversionInstructions.3.2.ll b/llvm/test/Bitcode/conversionInstructions.3.2.ll
index 550d443..2aa1564 100644
--- a/llvm/test/Bitcode/conversionInstructions.3.2.ll
+++ b/llvm/test/Bitcode/conversionInstructions.3.2.ll
@@ -1,5 +1,5 @@
 ; RUN: llvm-dis < %s.bc| FileCheck %s
-; RUN: verify-uselistorder < %s.bc -preserve-bc-use-list-order -num-shuffles=5
+; RUN: verify-uselistorder < %s.bc -preserve-bc-use-list-order
 
 ; conversionOperations.3.2.ll.bc was generated by passing this file to llvm-as-3.2.
 ; The test checks that LLVM does not misread conversion instructions from