src: fix largepages regression

During the addition of macOS support for large pages, a `memcpy` ended
up under the wrong preprocessor directive. As a result, the newly
allocated large pages were not initialized with a copy of the text
section.

Thanks to Suresh Srinivas <[email protected]>!

PR-URL: #29914
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: David Carlier <[email protected]>

Author: Gabriel Schulhof

src/large_pages/node_large_page.cc

@@ -359,6 +359,7 @@ MoveTextRegionToLargePages(const text_region& r) {
     }
     return -1;
   }
+  memcpy(start, nmem, size);
 #elif defined(__FreeBSD__)
   tmem = mmap(start, size,
               PROT_READ | PROT_WRITE | PROT_EXEC,
@@ -393,8 +394,6 @@ MoveTextRegionToLargePages(const text_region& r) {
     return -1;
   }
   memcpy(start, tmem, size);
-#else
-  memcpy(start, nmem, size);
 #endif
 
   ret = mprotect(start, size, PROT_READ | PROT_EXEC);