Add -O0 to CMake debug build configuration

The default optimization level may interfere with debugging.

Change-Id: Ie694ef35b05e4cf2bf4f68bc346e8d60a2d27bc8

runtime/hsa-runtime/cmake_modules/hsa_common.cmake

@@ -63,7 +63,7 @@ if(UNIX)
     set ( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32" )
   endif ()
   if ( "${CMAKE_BUILD_TYPE}" STREQUAL Debug )
-    set ( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ggdb" )
+    set ( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O0 -ggdb" )
   endif ()
   add_definitions(-D __STDC_LIMIT_MACROS)
   add_definitions(-D __STDC_CONSTANT_MACROS)