Break up headers into constituent parts

This is part of a broader change to make header files better represent the
dependencies between one another (see
https://github.com/jemalloc/jemalloc/issues/533). It breaks up component headers
into smaller parts that can be made to have a simpler dependency graph.

For the autogenerated headers (smoothstep.h and size_classes.h), no splitting
was necessary, so I didn't add support to emit multiple headers.

include/jemalloc/internal/arena_inlines_a.h

@@ -0,0 +1,91 @@
+#ifndef JEMALLOC_INTERNAL_ARENA_INLINES_A_H
+#define JEMALLOC_INTERNAL_ARENA_INLINES_A_H
+
+#ifndef JEMALLOC_ENABLE_INLINE
+unsigned	arena_ind_get(const arena_t *arena);
+void	arena_internal_add(arena_t *arena, size_t size);
+void	arena_internal_sub(arena_t *arena, size_t size);
+size_t	arena_internal_get(arena_t *arena);
+bool	arena_prof_accum_impl(arena_t *arena, uint64_t accumbytes);
+bool	arena_prof_accum_locked(arena_t *arena, uint64_t accumbytes);
+bool	arena_prof_accum(tsdn_t *tsdn, arena_t *arena, uint64_t accumbytes);
+#endif /* JEMALLOC_ENABLE_INLINE */
+
+#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_ARENA_C_))
+
+JEMALLOC_INLINE unsigned
+arena_ind_get(const arena_t *arena)
+{
+
+	return (base_ind_get(arena->base));
+}
+
+JEMALLOC_INLINE void
+arena_internal_add(arena_t *arena, size_t size)
+{
+
+	atomic_add_zu(&arena->stats.internal, size);
+}
+
+JEMALLOC_INLINE void
+arena_internal_sub(arena_t *arena, size_t size)
+{
+
+	atomic_sub_zu(&arena->stats.internal, size);
+}
+
+JEMALLOC_INLINE size_t
+arena_internal_get(arena_t *arena)
+{
+
+	return (atomic_read_zu(&arena->stats.internal));
+}
+
+JEMALLOC_INLINE bool
+arena_prof_accum_impl(arena_t *arena, uint64_t accumbytes)
+{
+
+	cassert(config_prof);
+	assert(prof_interval != 0);
+
+	arena->prof_accumbytes += accumbytes;
+	if (arena->prof_accumbytes >= prof_interval) {
+		arena->prof_accumbytes %= prof_interval;
+		return (true);
+	}
+	return (false);
+}
+
+JEMALLOC_INLINE bool
+arena_prof_accum_locked(arena_t *arena, uint64_t accumbytes)
+{
+
+	cassert(config_prof);
+
+	if (likely(prof_interval == 0))
+		return (false);
+	return (arena_prof_accum_impl(arena, accumbytes));
+}
+
+JEMALLOC_INLINE bool
+arena_prof_accum(tsdn_t *tsdn, arena_t *arena, uint64_t accumbytes)
+{
+
+	cassert(config_prof);
+
+	if (likely(prof_interval == 0))
+		return (false);
+
+	{
+		bool ret;
+
+		malloc_mutex_lock(tsdn, &arena->lock);
+		ret = arena_prof_accum_impl(arena, accumbytes);
+		malloc_mutex_unlock(tsdn, &arena->lock);
+		return (ret);
+	}
+}
+
+#endif /* (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_ARENA_C_)) */
+
+#endif /* JEMALLOC_INTERNAL_ARENA_INLINES_A_H */