Test case for bug 19437.

[dnovillo]

Summary

This depends on D3413.

[dblaikie]

We don't do end-to-end testing like this in clang.
The testing in LLVM is sufficient & this review can be cancelled.

test/CodeGen/dwarf4-discriminators.c

+// Test that disciminators are only added for DWARF 4 and later.
+
+// RUN: %clang -target x86_64-linux-gnu -g -S -o - %s | FileCheck %s --check-prefix=LINUX
+// RUN: %clang -target x86_64-apple-darwin -g -S -o - %s | FileCheck %s --check-prefix=DARWIN
+int foo(long i) {
+  if (i < 5) return 2; else return 90;
+}
+// LINUX:  .loc    1 {{[0-9]+}} 0 discriminator 1   #
+// LINUX:  .loc    1 {{[0-9]+}} 0 discriminator 2   #
+// DARWIN: .loc    1 {{[0-9]+}} 0 prologue_end      #