[reland] algorithm_test.cpp

[gchatelet]

Summary

Removing -ffreestanding for the tests should allow us to use <iostream>

[courbet]

Cool, this is so much better than having to re-code everything :)

[gchatelet]

Let's see if build bots stay green :)

[gchatelet]

In D128916#3624604, @gchatelet wrote:

Let's see if build bots stay green :)

They didn't, reverting once more...

libc/test/src/string/memory_utils/CMakeLists.txt

+# These tests are only exercising implementation details
+#  - They don't need to be compiled with '-ffreestanding'
+#  - They can use C++ facilities like <iostream>.
 add_libc_unittest(
-  utils_test
+  implementation_details_test
   SUITE
     libc_string_unittests
   SRCS
     address_test.cpp
-    # algorithm_test.cpp
+    algorithm_test.cpp
     backend_test.cpp
     elements_test.cpp
     memory_access_test.cpp
     utils_test.cpp
   COMPILE_OPTIONS
     ${LIBC_COMPILE_OPTIONS_NATIVE}
-    -ffreestanding
-    -pthread
   DEPENDS
     libc.src.string.memory_utils.memory_utils
     libc.src.__support.CPP.array
     libc.src.__support.CPP.array_ref
 )