Introduce print-memderefs to test isDereferenceablePointer

Since testing the function indirectly is tricky, introduce a direct
print-memderefs pass, in the same spirit as print-memdeps, which prints
dereferenceability information matched by FileCheck.

Differential Revision: http://reviews.llvm.org/D7075

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228369 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/Passes.h

@@ -162,6 +162,14 @@ namespace llvm {
   // createJumpInstrTableInfoPass - This creates a pass that stores information
   // about the jump tables created by JumpInstrTables
   ImmutablePass *createJumpInstrTableInfoPass();
+
+  //===--------------------------------------------------------------------===//
+  //
+  // createMemDerefPrinter - This pass collects memory dereferenceability
+  // information and prints it with -analyze.
+  //
+  FunctionPass *createMemDerefPrinter();
+
 }
 
 #endif