[build] set -fno-omit-frame-pointer

This patch sets the `-fno-omit-frame-pointer` for non release builds.
This is useful for a few things:
- makes stack traces more reliable and complete
- enables better profiling with tools like perf
- better visibility into call chains during performance analysis

It has a small impact on performance as an extra register needs to be
used, e.g., the `rbp` register on x86_64 to store the frame pointer. It
also incurs a small of setup and teardown of stack frames. Because of
these reasons, this is currently only set for non release builds.

CMakeLists.txt

@@ -34,9 +34,9 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 set(CMAKE_OPTIMIZE_DEPENDENCIES 1)
 
-set(CMAKE_CXX_FLAGS_DEBUG="${CMAKE_CXX_FLAGS_DEBUG} -g")
+set(CMAKE_CXX_FLAGS_DEBUG="${CMAKE_CXX_FLAGS_DEBUG} -g -fno-omit-frame-pointer")
 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3")
-set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -g -O3")
+set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -g -O3 -fno-omit-frame-pointer")
 
 # silence a warning about DEPFILE path transformations (used in LLVM)
 cmake_policy(SET CMP0116 OLD)