Make sure to keep symbols for profile build.

Patch by Benoit Boissinot. Thanks, Benoit!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@38490 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile.rules b/Makefile.rules
index 84c5eaf..2852ac3 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -213,6 +213,7 @@
   CXX.Flags := $(OPTIMIZE_OPTION) -pg -g
   C.Flags   := $(OPTIMIZE_OPTION) -pg -g
   LD.Flags  := $(OPTIMIZE_OPTION) -pg -g
+  KEEP_SYMBOLS := 1
 else
   ifeq ($(ENABLE_OPTIMIZED),1)
     BuildMode := Release