[bigint] Drop duplicate interrupt check

which was probably added by mistake.

Change-Id: Iba265309710115aae8d9a0b7c0ede7e0160a662a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1662302
Auto-Submit: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62220}

src/objects/bigint.cc

@@ -2191,10 +2191,6 @@ MaybeHandle<String> MutableBigInt::ToStringGeneric(Isolate* isolate,
           // the raw characters pointer (as the string might have moved).
           chars = result->GetChars(no_gc);
         }
-        if (interrupt_check.InterruptRequested() &&
-            isolate->stack_guard()->HandleInterrupts().IsException(isolate)) {
-          return MaybeHandle<String>();
-        }
       }
     } while (nonzero_digit > 0);
     last_digit = rest->digit(0);