fix(heap): avoid malloc calls optimization

GCC defines that malloc(0) returns a non-null pointer (glibc behavior).
This can break logic for some cases, because our implementation of
malloc(0) returns null pointer.
POSIX and the ISO C standard allow both behaviors.

Author: Lapshin

CMakeLists.txt

@@ -170,7 +170,7 @@ if(CONFIG_COMPILER_DUMP_RTL_FILES)
 endif()
 
 if(CMAKE_C_COMPILER_ID MATCHES "GNU" AND CMAKE_C_COMPILER_VERSION VERSION_GREATER 15.0)
-    list(APPEND c_compile_options "-fzero-init-padding-bits=all")
+    list(APPEND c_compile_options "-fzero-init-padding-bits=all" "-fno-malloc-dce")
 endif()
 
 __generate_prefix_map(prefix_map_compile_options)