[bazel] Adds new bigint files

Bug: v8:11234
Change-Id: I5fa2d97e01df25171c2a80aafb265b508176b334
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2967470
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75206}

BUILD.bazel

@@ -2213,6 +2213,9 @@ filegroup(
         "src/bigint/bigint-internal.h",
         "src/bigint/bigint.h",
         "src/bigint/digit-arithmetic.h",
+        "src/bigint/div-helpers.cc",
+        "src/bigint/div-helpers.h",
+        "src/bigint/div-schoolbook.cc",
         "src/bigint/mul-karatsuba.cc",
         "src/bigint/mul-schoolbook.cc",
         "src/bigint/util.h",