assert(0) -> LLVM_UNREACHABLE.

Make llvm_unreachable take an optional string, thus moving the cerr<< out of
line.
LLVM_UNREACHABLE is now a simple wrapper that makes the message go away for
NDEBUG builds.

llvm-svn: 75379

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/Support/ErrorHandling.cpp b/llvm/lib/Support/ErrorHandling.cpp
index 2a5d906c878..f2e247c5274 100644
--- a/llvm/lib/Support/ErrorHandling.cpp
+++ b/llvm/lib/Support/ErrorHandling.cpp
@@ -44,7 +44,9 @@ void llvm_report_error(const std::string &reason) {
   exit(1);
 }
 
-void llvm_unreachable(void) {
+void llvm_unreachable(const char *msg) {
+  if (msg)
+    errs() << msg << "\n";
   abort();
 }
 }