Add a CMake option COMPILER_RT_DEBUG for building runtimes with full debug info.

Differential Revision: http://llvm-reviews.chandlerc.com/D1984

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@193449 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/lit.common.cfg b/lib/lit.common.cfg
index 4be6921..6c2b4cc 100644
--- a/lib/lit.common.cfg
+++ b/lib/lit.common.cfg
@@ -56,3 +56,7 @@
 if compiler_rt_arch:
   for arch in compiler_rt_arch.split(";"):
     config.available_features.add(arch + "-supported-target")
+
+compiler_rt_debug = getattr(config, 'compiler_rt_debug', False)
+if not compiler_rt_debug:
+  config.available_features.add('compiler-rt-optimized')