After converting assert(0) to LLVM_UNREACHABLE we lost file/line location.
Fix by making the LLVM_UNREACHABLE pass __FILE__ and __LINE__ to
llvm_unreachable.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75631 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/ErrorHandling.cpp b/lib/Support/ErrorHandling.cpp
index f2e247c..be0b380 100644
--- a/lib/Support/ErrorHandling.cpp
+++ b/lib/Support/ErrorHandling.cpp
@@ -44,9 +44,13 @@
   exit(1);
 }
 
-void llvm_unreachable(const char *msg) {
+void llvm_unreachable(const char *msg, const char *file, unsigned line) {
   if (msg)
     errs() << msg << "\n";
+  errs() << "UNREACHABLE executed";
+  if (file)
+    errs() << " at " << file << ":" << line;
+  errs() << "!\n";
   abort();
 }
 }