When compiling with RelWithDebInfo, always use -fno-omit-frame-pointer

(if this option is present). perf, and other tools that do stack walking
works much better with it.

CMakeLists.txt

@@ -241,6 +241,9 @@ IF (WITH_MSAN)
   MY_CHECK_AND_SET_COMPILER_FLAG("-fsanitize=memory -fsanitize-memory-track-origins -U_FORTIFY_SOURCE" DEBUG RELWITHDEBINFO)
 ENDIF()
 
+# Be nice to profilers etc
+MY_CHECK_AND_SET_COMPILER_FLAG("-fno-omit-frame-pointer" RELWITHDEBINFO)
+
 # enable security hardening features, like most distributions do
 # in our benchmarks that costs about ~1% of performance, depending on the load
 OPTION(SECURITY_HARDENED "Use security-enhancing compiler features (stack protector, relro, etc)" ON)