PR #1888: Adjust Table.GrowExtremelyLargeTable to avoid OOM on i386

Imported from GitHub PR #1888

While this only covers `i386`/`i686`, which is the motivation for this PR, this test can be expected to OOM on any 32-bit platform. For now, this is the minimal change that avoids the problem [in the Fedora package](https://src.fedoraproject.org/rpms/abseil-cpp/).

This fixes one of the two test failures reported in #1887.
Merge 395acb7 into f28774a

Merging this change closes #1888

COPYBARA_INTEGRATE_REVIEW=#1888 from musicinmybrain:extremely-large-table-32-bit 395acb7
PiperOrigin-RevId: 759154889
Change-Id: I0a105fc42c51898c277b4a056ccd6599b43e1a50

Author: musicinmybrain

absl/container/internal/raw_hash_set_test.cc

@@ -4267,8 +4267,8 @@ struct ConstUint8Hash {
 // 5. Finally we will catch up and go to overflow codepath.
 TEST(Table, GrowExtremelyLargeTable) {
   constexpr size_t kTargetCapacity =
-#if defined(__wasm__) || defined(__asmjs__)
-      NextCapacity(ProbedItem4Bytes::kMaxNewCapacity);  // OOMs on WASM.
+#if defined(__wasm__) || defined(__asmjs__) || defined(__i386__)
+      NextCapacity(ProbedItem4Bytes::kMaxNewCapacity);  // OOMs on WASM, 32-bit.
 #else
       NextCapacity(ProbedItem8Bytes::kMaxNewCapacity);
 #endif