Revert "Add a test for debug info with the safestack sanitizer enabled."

This reverts commit r299730.

It's causing failures on a bot because of missing compiler-rt:
http://green.lab.llvm.org/green/job/clang-stage2-cmake-RgSan_check

llvm-svn: 300460

debuginfo-tests/safestack.c

@@ -1,21 +0,0 @@
-// RUN: %clang %target_itanium_abi_host_triple -arch x86_64 %s -o %t.out -g -fsanitize=safe-stack
-// RUN: %test_debuginfo %s %t.out
-//
-// DEBUGGER: break 15
-// DEBUGGER: r
-// DEBUGGER: p s
-//
-// CHECK: a = ([0] = 0, [1] = 1, [2] = 2, [3] = 3, [4] = 4, [5] = 5, [6] = 6, [7] = 7)
-
-struct S {
-  int a[8];
-};
-
-int f(struct S s, unsigned i) {
-  return s.a[i];
-}
-
-int main(int argc, const char **argv) {
-  struct S s = {{0, 1, 2, 3, 4, 5, 6, 7}};
-  return f(s, 4);
-}