probable initialization errors of heap allocated objects

[chqrlie]

I amended the library file libs/libc/stdlib.c2 this way:

// [...]
import string;
// [...]
#if 1
public fn void* malloc(c_size size) {
    void *p = calloc(size, 1);
    if (p) return string.memset(p, 0xff, size);
    return p;
}
#else
fn void* malloc(c_size size);
#endif

Running some tests with this library patch makes the compiler hang on macOS with an infinite loop.

output/tester/tester -v test/template/function/opaque_template_arg_ok.c2t

I suspect this is caused by a missing initializer for a field in an object allocated from the heap (directly or indirectly).