Calculate a checksum for the system image (#48869)

(cherry picked from commit 48b4caa)

Author: timholy

src/staticdata.c

@@ -3367,10 +3367,9 @@ static jl_value_t *jl_restore_package_image_from_stream(ios_t *f, jl_image_t *im
     return restored;
 }
 
-static void jl_restore_system_image_from_stream(ios_t *f, jl_image_t *image)
+static void jl_restore_system_image_from_stream(ios_t *f, jl_image_t *image, uint32_t checksum)
 {
-    uint64_t checksum = 0; // TODO: make this real
-    jl_restore_system_image_from_stream_(f, image, NULL, checksum, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
+    jl_restore_system_image_from_stream_(f, image, NULL, checksum | ((uint64_t)0xfdfcfbfa << 32), NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
 }
 
 JL_DLLEXPORT jl_value_t *jl_restore_incremental_from_buf(const char *buf, jl_image_t *image, size_t sz, jl_array_t *depmods, int complete)
@@ -3421,8 +3420,9 @@ JL_DLLEXPORT void jl_restore_system_image(const char *fname)
         if (ios_readall(&f, sysimg, len) != len)
             jl_errorf("Error reading system image file.");
         ios_close(&f);
+        uint32_t checksum = jl_crc32c(0, sysimg, len);
         ios_static_buffer(&f, sysimg, len);
-        jl_restore_system_image_from_stream(&f, &sysimage);
+        jl_restore_system_image_from_stream(&f, &sysimage, checksum);
         ios_close(&f);
         JL_SIGATOMIC_END();
     }
@@ -3433,7 +3433,8 @@ JL_DLLEXPORT void jl_restore_system_image_data(const char *buf, size_t len)
     ios_t f;
     JL_SIGATOMIC_BEGIN();
     ios_static_buffer(&f, (char*)buf, len);
-    jl_restore_system_image_from_stream(&f, &sysimage);
+    uint32_t checksum = jl_crc32c(0, buf, len);
+    jl_restore_system_image_from_stream(&f, &sysimage, checksum);
     ios_close(&f);
     JL_SIGATOMIC_END();
 }