Add NDEBUG flag to release profile of ARMC6

Author: deepikabhavnani

tools/profiles/release.json

@@ -19,7 +19,7 @@
                    "-Wno-armcc-pragma-push-pop", "-Wno-armcc-pragma-anon-unions",
                    "-DMULADDC_CANNOT_USE_R7", "-fdata-sections",
                    "-fno-exceptions", "-MMD", "-D_LIBCPP_EXTERN_TEMPLATE(...)=",
-                   "-fshort-enums", "-fshort-wchar"],
+                   "-fshort-enums", "-fshort-wchar", "-DNDEBUG"],
         "asm": [],
         "c": ["-D__ASSERT_MSG", "-std=gnu99"],
         "cxx": ["-fno-rtti", "-std=gnu++98"],