llvm-symbolizer test: Add a bit of extra detail on how to compile/reproduce this

The details are also in the .test file, but doesn't hurt to make it a
bit clearer.

diff --git a/llvm/test/tools/llvm-symbolizer/Inputs/discrim.c b/llvm/test/tools/llvm-symbolizer/Inputs/discrim.c
index e53cbd4..5500f09 100644 (file)
--- a/llvm/test/tools/llvm-symbolizer/Inputs/discrim.c
+++ b/llvm/test/tools/llvm-symbolizer/Inputs/discrim.c
@@ -1,3 +1,7 @@
+// Compile with:  clang -gmlt -fdebug-info-for-profiling -O2 discrim.c -o discrim
+// to get an input file with DWARF line table discriminators in it.
+// Tested in test/tools/llvm-symbolizer/sym-verbose.test
+
 static volatile int do_mul;
 static volatile int x, v;