Export of internal Abseil changes

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1639d4832e961761060e61196e45948e25dc2676 by Derek Mauro <dmauro@google.com>:

Delete GCC 4.8 test script. GCC 4.8 is no longer supported.

PiperOrigin-RevId: 264485899

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2a9b2182646b6c6675dce614dcce2c18174303d3 by Derek Mauro <dmauro@google.com>:

Make btree_test work with exceptions both enabled and disabled

PiperOrigin-RevId: 264473656
GitOrigin-RevId: 1639d4832e961761060e61196e45948e25dc2676
Change-Id: Ica58a2328fa261ecc4c4be410f68f97942074025

absl/container/BUILD.bazel

@@ -887,6 +887,7 @@ cc_test(
         ":btree_test_common",
         ":counting_allocator",
         ":test_instance_tracker",
+        "//absl/base:core_headers",
         "//absl/base:raw_logging_internal",
         "//absl/flags:flag",
         "//absl/hash:hash_testing",

absl/container/CMakeLists.txt

@@ -75,6 +75,7 @@ absl_cc_test(
     absl::btree
     absl::btree_test_common
     absl::compare
+    absl::core_headers
     absl::counting_allocator
     absl::flags
     absl::hash_testing

absl/container/btree_test.cc

@@ -25,6 +25,7 @@
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 #include "absl/base/internal/raw_logging.h"
+#include "absl/base/macros.h"
 #include "absl/container/btree_map.h"
 #include "absl/container/btree_set.h"
 #include "absl/container/internal/counting_allocator.h"
@@ -1537,12 +1538,11 @@ TEST(Btree, MapAt) {
   const absl::btree_map<int, int> &const_map = map;
   EXPECT_EQ(const_map.at(1), 2);
   EXPECT_EQ(const_map.at(2), 8);
-  try {
-    map.at(3);
-    FAIL() << "Exception not thrown";
-  } catch (const std::out_of_range& e) {
-    EXPECT_STREQ(e.what(), "absl::btree_map::at");
-  }
+#ifdef ABSL_HAVE_EXCEPTIONS
+  EXPECT_THROW(map.at(3), std::out_of_range);
+#else
+  EXPECT_DEATH(map.at(3), "absl::btree_map::at");
+#endif
 }
 
 TEST(Btree, BtreeMultisetEmplace) {