[libc++][C++03] Fix a bunch of random tests (llvm#144117)

This fixes/removes a bunch of random tests. They all failed in
relatively simple to fix ways.

Specificially (all inside `libcxx/test/libcxx-03`):
- `utilities/template.bitset/includes.pass.cpp`: the header guards have
different names now (guard names fixed)
- `utilities/meta/is_referenceable.compile.pass.cpp`: The name changed
from `__libcpp_is_referenceable` (reverted name)
- `utilities/function.objects/refwrap/desugars_to.compile.pass.cpp`:
Optimization has been added after the header split (test removed)
- `type_traits/is_replaceable.compile.pass.cpp`: `__is_replacable_v` has
been added after the header split (test removed)
- `type_traits/is_constant_evaluated.pass.cpp`: Ran C++11 code
accidentally (C++11 test parts removed)
- `type_traits/desugars_to.compile.pass.cpp`: Optimization has been
added after the header split (test removed)
- `numerics/bit.ops.pass.cpp`: Tried to include header which doesn't
exist (removed include and related code which wasn't executed in C++03)
- `experimental/fexperimental-library.compile.pass.cpp`: This test is
irrelevant for C++03, since there are no C++03 experimental features
(test removed)
- `containers/container_traits.compile.pass.cpp`: `container_traits`
have been introduced after the header split (test removed)

Author: philnik777

libcxx/test/libcxx-03/containers/container_traits.compile.pass.cpp

@@ -11,10 +11,8 @@
 //
 // Comparison operators
 
-// XFAIL: FROZEN-CXX03-HEADERS-FIXME
-
 #include <concepts>
-#include <__iterator/bounded_iter.h>
+#include <__cxx03/__iterator/bounded_iter.h>
 
 #include "test_iterators.h"
 #include "test_macros.h"

libcxx/test/libcxx-03/iterators/bounded_iter/comparison.pass.cpp

@@ -9,11 +9,8 @@
 // Test the __XXXX routines in the <bit> header.
 // These are not supposed to be exhaustive tests, just sanity checks.
 
-// XFAIL: FROZEN-CXX03-HEADERS-FIXME
-
-#include <__bit/bit_log2.h>
-#include <__bit/countl.h>
-#include <__bit/rotate.h>
+#include <__cxx03/__bit/countl.h>
+#include <__cxx03/__bit/rotate.h>
 #include <cassert>
 
 #include "test_macros.h"
@@ -27,11 +24,6 @@ TEST_CONSTEXPR_CXX14 bool test() {
   assert(std::__rotr(v, 3) == 0x02468acfU);
   assert(std::__countl_zero(v) == 3);
 
-#if TEST_STD_VER > 17
-  ASSERT_SAME_TYPE(unsigned, decltype(std::__bit_log2(v)));
-  assert(std::__bit_log2(v) == 28);
-#endif
-
   return true;
 }
 

libcxx/test/libcxx-03/numerics/bit.ops.pass.cpp

@@ -14,9 +14,7 @@
 // returns false when there's no constant evaluation support from the compiler.
 //  as well as when called not in a constexpr context
 
-// XFAIL: FROZEN-CXX03-HEADERS-FIXME
-
-#include <__type_traits/is_constant_evaluated.h>
+#include <__cxx03/__type_traits/is_constant_evaluated.h>
 #include <cassert>
 
 #include "test_macros.h"
@@ -25,10 +23,6 @@ int main (int, char**) {
     ASSERT_SAME_TYPE(decltype(std::__libcpp_is_constant_evaluated()), bool);
     ASSERT_NOEXCEPT(std::__libcpp_is_constant_evaluated());
 
-#if !defined(_LIBCPP_CXX03_LANG)
-    static_assert(std::__libcpp_is_constant_evaluated(), "");
-#endif
-
     bool p = std::__libcpp_is_constant_evaluated();
     assert(!p);