LibC+DynamicLoader: Move "transactional memory" GCC stubs to LibC

Instead of having a special case in the dynamic loader where we ignore
TM-related GCC symbols, just stub them out in LibC like we already do
for various other things we don't support.

Userland/Libraries/LibC/CMakeLists.txt

@@ -32,6 +32,7 @@ set(LIBC_SOURCES
     stdlib.cpp
     string.cpp
     strings.cpp
+    stubs.cpp
     syslog.cpp
     sys/prctl.cpp
     sys/ptrace.cpp

Userland/Libraries/LibC/stubs.cpp

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+extern "C" {
+
+#define DO_STUB(name) \
+    void name();      \
+    void name() { }
+
+DO_STUB(__register_frame_info);
+DO_STUB(__deregister_frame_info);
+DO_STUB(_ITM_registerTMCloneTable);
+DO_STUB(_ITM_deregisterTMCloneTable);
+}

Userland/Libraries/LibELF/DynamicLoader.cpp

@@ -427,12 +427,6 @@ DynamicLoader::RelocationResult DynamicLoader::do_relocation(size_t total_tls_si
         auto symbol = relocation.symbol();
         auto res = lookup_symbol(symbol);
         if (!res.has_value()) {
-            // We do not support these
-            // TODO: Can we tell gcc not to generate the piece of code that uses these?
-            // (--disable-tm-clone-registry flag in gcc configuration?)
-            if (symbol.name().is_one_of("__deregister_frame_info"sv, "_ITM_registerTMCloneTable"sv, "_ITM_deregisterTMCloneTable"sv, "__register_frame_info"sv))
-                break;
-
             if (symbol.bind() == STB_WEAK)
                 return RelocationResult::ResolveLater;