LD_PRELOAD malloc wrapper + line stats for Perl

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 enum tr_fn {
	TR_FREE = 0,
	TR_MEMALIGN = 1,
	TR_MALLOC = 2,
	TR_REALLOC = 3,
	TR_CALLOC = 4,
};
static const uintptr_t TR_MASK = 7;

struct tr_memalign {
	uintptr_t ret;
	size_t alignment;
	size_t size;
};

struct tr_free {
	uintptr_t ptr;
};

struct tr_malloc {
	uintptr_t ret;
	size_t size;
};

struct tr_realloc {
	uintptr_t ret;
	uintptr_t ptr;
	size_t size;
};

struct tr_calloc {
	uintptr_t ret;
	size_t size;
};