Extent -> Ehooks: Move purge_lazy hook.

src/ehooks.c

@@ -126,3 +126,21 @@ ehooks_default_decommit(extent_hooks_t *extent_hooks, void *addr, size_t size,
     size_t offset, size_t length, unsigned arena_ind) {
 	return ehooks_default_decommit_impl(addr, offset, length);
 }
+
+#ifdef PAGES_CAN_PURGE_LAZY
+bool
+ehooks_default_purge_lazy_impl(void *addr, size_t offset, size_t length) {
+	return pages_purge_lazy((void *)((uintptr_t)addr + (uintptr_t)offset),
+	    length);
+}
+
+bool
+ehooks_default_purge_lazy(extent_hooks_t *extent_hooks, void *addr, size_t size,
+    size_t offset, size_t length, unsigned arena_ind) {
+	assert(addr != NULL);
+	assert((offset & PAGE_MASK) == 0);
+	assert(length != 0);
+	assert((length & PAGE_MASK) == 0);
+	return ehooks_default_purge_lazy_impl(addr, offset, length);
+}
+#endif