Add regression test for verbose llvm-symbolizer output

[sque]

Summary

Previous patch https://reviews.llvm.org/D29094 did not include a
regression test.

llvm/trunk/test/tools/llvm-symbolizer/Inputs/discrim.c

+static volatile int do_mul;
+static volatile int do_inc;
+
+int main () {
+  int x = 1;
+  if (do_mul) x *= 2; else x /= 2;
+  return do_inc ? ++x : --x;
+}

llvm/trunk/test/tools/llvm-symbolizer/Inputs/discrim.inp

+some text
+0x4004f2
+0x400509
+0x40050d
+some more text

llvm/trunk/test/tools/llvm-symbolizer/sym-verbose.test

+#static volatile int do_mul;
+#static volatile int do_inc;
+#
+#int main () {
+#  int x = 1;
+#  if (do_mul) x *= 2; else x /= 2;
+#  return do_inc ? ++x : --x;
+#}
+#Build as : clang -g -O2 discrim.c -o discrim
+
+RUN: llvm-symbolizer -verbose -print-address -obj=%p/Inputs/discrim < %p/Inputs/discrim.inp | FileCheck %s
+
+#CHECK: some text
+
+#CHECK: 0x4004f2
+#CHECK-NEXT: main
+#CHECK-NEXT: Filename: /tmp/discrim.c
+#CHECK-NEXT: Line: 6
+#CHECK-NEXT: Column: 7
+#CHECK-NOT: Discriminator: 0
+
+#CHECK: 0x400509
+#CHECK-NEXT: main
+#CHECK-NEXT: Filename: /tmp/discrim.c
+#CHECK-NEXT: Line: 7
+#CHECK-NEXT: Column: 3
+#CHECK-NEXT: Discriminator: 1
+
+#CHECK: 0x40050d
+#CHECK-NEXT: main
+#CHECK-NEXT: Filename: /tmp/discrim.c
+#CHECK-NEXT: Line: 7
+#CHECK-NEXT: Column: 3
+#CHECK-NEXT: Discriminator: 2
+
+#CHECK: some more text