Try to guard a test that requires DEBUG().

This is a follow-up patch for r185524. Being assert enabled does not mean
that DEBUG() is enabled, so we need to check the existence of DEBUG() itself.

llvm-svn: 185619

lld/test/layout-error-test.objtxt

@@ -1,4 +1,4 @@
-# REQUIRES: asserts
+# REQUIRES: debug
 # RUN: lld -core --add-pass layout -mllvm -debug-only=LayoutPass %s 2>&1 \
 # RUN:   | FileCheck %s -check-prefix=CHECK
 

lld/test/lit.cfg

@@ -126,6 +126,8 @@ except OSError, why:
     print "Could not find llc in " + llvm_tools_dir
     exit(42)
 
+if re.search(r'DEBUG', llc_cmd.stdout.read()):
+    config.available_features.add('debug')
 if re.search(r'with assertions', llc_cmd.stdout.read()):
     config.available_features.add('asserts')
 llc_cmd.wait()