Skip very large input test in 32-bit as it might cause OOMs.

PiperOrigin-RevId: 738955336

src/google/protobuf/micro_string_test.cc

diff --git a/src/google/protobuf/micro_string_test.cc b/src/google/protobuf/micro_string_test.cc
index f8fa01d..c70df7f 100644
--- a/src/google/protobuf/micro_string_test.cc
+++ b/src/google/protobuf/micro_string_test.cc
@@ -783,6 +783,11 @@
 }
 
 TEST(MicroStringTest, SetInChunksWontPreallocateForVeryLargeFakeSize) {
+  if (sizeof(void*) < 8) {
+    GTEST_SKIP() << "Might not be possible to allocate that much memory on "
+                    "this platform.";
+  }
+
   MicroString str;
   str.SetInChunks(1'000'000'000, nullptr, [](auto append) {
     append("first");