[libc++] Remove the c++98 Lit feature from the test suite

C++98 and C++03 are effectively aliases as far as Clang is concerned.
As such, allowing both std=c++98 and std=c++03 as Lit parameters is
just slightly confusing, but provides no value. It's similar to allowing
both std=c++17 and std=c++1z, which we don't do.

This was discovered because we had an internal bot that ran the test
suite under both c++98 AND c++03 -- one of which is redundant.

Differential Revision: https://reviews.llvm.org/D80926

Author: ldionne

libcxx/docs/TestingLibcxx.rst

@@ -18,7 +18,7 @@
 //                    RandomNumberGenerator& rand);
 
 // UNSUPPORTED: clang-4.0
-// UNSUPPORTED: c++98, c++03, c++11
+// UNSUPPORTED: c++03, c++11
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_CXX17_REMOVED_RANDOM_SHUFFLE
 

libcxx/test/libcxx/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle.depr_in_cxx14.verify.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// UNSUPPORTED: libcpp-has-no-threads, c++98, c++03
+// UNSUPPORTED: libcpp-has-no-threads, c++03
 // REQUIRES: libatomic
 // FILE_DEPENDENCIES: %t.exe
 // RUN: %{build} -latomic

libcxx/test/libcxx/atomics/atomics.align/align.pass.sh.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: c++98, c++03
+// UNSUPPORTED: c++03
 
 // Test that libc++ does not generate a warning diagnostic about the comparator
 // too early for containers of incomplete types.

libcxx/test/libcxx/containers/associative/non_const_comparator.incomplete.verify.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: c++98, c++03
+// UNSUPPORTED: c++03
 // REQUIRES: diagnose-if-support
 
 // Test that libc++ generates a warning diagnostic when the container is

libcxx/test/libcxx/containers/associative/non_const_comparator.verify.cpp

@@ -5,7 +5,7 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
-// UNSUPPORTED: c++98, c++03
+// UNSUPPORTED: c++03
 // UNSUPPORTED: windows
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DEBUG=1

libcxx/test/libcxx/containers/sequences/array/array.zero/db_back.pass.cpp

@@ -5,7 +5,7 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
-// UNSUPPORTED: c++98, c++03
+// UNSUPPORTED: c++03
 // UNSUPPORTED: windows
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DEBUG=1

libcxx/test/libcxx/containers/sequences/array/array.zero/db_front.pass.cpp

@@ -5,7 +5,7 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
-// UNSUPPORTED: c++98, c++03
+// UNSUPPORTED: c++03
 // UNSUPPORTED: windows
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DEBUG=1

libcxx/test/libcxx/containers/sequences/array/array.zero/db_indexing.pass.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: c++98, c++03
+// UNSUPPORTED: c++03
 
 // <deque>
 

libcxx/test/libcxx/containers/sequences/deque/spare_block_handling.pass.cpp

@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: c++98, c++03
+// UNSUPPORTED: c++03
 
 // Can't test the system lib because this test enables debug mode
 // UNSUPPORTED: with_system_cxx_lib=macosx