[PATCH] Assert that DebugLoc is valid

[Davide Italiano]

Hi dexonsmith,

Noticed when trying to fix PR23380.
I think it's better to assert than segfaulting one line below.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9464

Files:
  lib/IR/DiagnosticInfo.cpp

Index: lib/IR/DiagnosticInfo.cpp
===================================================================
--- lib/IR/DiagnosticInfo.cpp
+++ lib/IR/DiagnosticInfo.cpp
@@ -136,6 +136,7 @@
                                                  unsigned *Line,
                                                  unsigned *Column) const {
   DILocation *L = getDebugLoc();
+  assert(L != nullptr && "debug location is invalid");
   *Filename = L->getFilename();
   *Line = L->getLine();
   *Column = L->getColumn();

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