[lldb][test] Fix some 'import-std-module' tests

Some tests from 'import-std-module' used to fail on the builder
https://lab.llvm.org/staging/#/builders/195/builds/4470,
since libcxx is set up to be linked statically with test binaries
on it.

Thus, they were temporarily disabled in #112530. Here, this commit
is reverted.

Jitted expressions from the tests try to call __libcpp_verbose_abort
function that is not present in the process image, which causes
the failure.

Here, this symbol is explicitly referenced from the test source files.

Author: dzhidzhoev

lldb/test/API/commands/expression/import-std-module/array/main.cpp

@@ -1,5 +1,10 @@
+#include <__verbose_abort>
 #include <array>
 
+// Some expressons from the test need this symbol to be compiled when libcxx is
+// built statically.
+void *libcpp_verbose_abort_ptr = (void *)&std::__libcpp_verbose_abort;
+
 struct DbgInfo {
   int v = 4;
 };

lldb/test/API/commands/expression/import-std-module/vector-dbg-info-content/main.cpp

@@ -1,5 +1,10 @@
+#include <__verbose_abort>
 #include <vector>
 
+// Some expressons from the test need this symbol to be compiled when libcxx is
+// built statically.
+void *libcpp_verbose_abort_ptr = (void *)&std::__libcpp_verbose_abort;
+
 struct Foo {
   int a;
 };

lldb/test/API/commands/expression/import-std-module/vector-of-vectors/main.cpp

@@ -1,5 +1,10 @@
+#include <__verbose_abort>
 #include <vector>
 
+// Some expressons from the test need this symbol to be compiled when libcxx is
+// built statically.
+void *libcpp_verbose_abort_ptr = (void *)&std::__libcpp_verbose_abort;
+
 int main(int argc, char **argv) {
   std::vector<std::vector<int> > a = {{1, 2, 3}, {3, 2, 1}};
   return 0; // Set break point at this line.