[compiler-rt] [compiler-rt] [sanitizer_common] Add a testcase reproducing SIGSEGV in ForEachMappedRegion (PR #208358)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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<details>
<summary>
You can test this locally with the following command:
</summary>

``````````bash
git-clang-format --diff origin/main HEAD --extensions c -- compiler-rt/test/sanitizer_common/TestCases/Linux/dlopen_image_base.c --diff_from_common_commit
``````````

:warning:
The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
:warning:

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<details>
<summary>
View the diff from clang-format here.
</summary>

``````````diff
diff --git a/compiler-rt/test/sanitizer_common/TestCases/Linux/dlopen_image_base.c b/compiler-rt/test/sanitizer_common/TestCases/Linux/dlopen_image_base.c
index c7f7639f4..e340d0bd2 100644
--- a/compiler-rt/test/sanitizer_common/TestCases/Linux/dlopen_image_base.c
+++ b/compiler-rt/test/sanitizer_common/TestCases/Linux/dlopen_image_base.c
@@ -7,13 +7,13 @@
 */
 
 #ifndef BUILD_SO
-#define _GNU_SOURCE
-#include <assert.h>
-#include <dlfcn.h>
-#include <link.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <unistd.h>
+#  define _GNU_SOURCE
+#  include <assert.h>
+#  include <dlfcn.h>
+#  include <link.h>
+#  include <stdbool.h>
+#  include <stdio.h>
+#  include <unistd.h>
 
 int main(int argc, char *argv[]) {
   char path[4096];
@@ -29,11 +29,11 @@ int main(int argc, char *argv[]) {
   dlinfo(handle, RTLD_DI_LINKMAP, &map);
   if (map) {
     printf("DSO link_map name: %s\n", map->l_name);
-    printf("DSO link_map l_addr: %p\n", (void*)map->l_addr);
+    printf("DSO link_map l_addr: %p\n", (void *)map->l_addr);
     int pipefd[2];
     bool readable = false;
     if (pipe(pipefd) == 0) {
-      if (write(pipefd[1], (void*)map->l_addr, 1) == 1) {
+      if (write(pipefd[1], (void *)map->l_addr, 1) == 1) {
         readable = true;
       }
       close(pipefd[0]);
@@ -50,6 +50,6 @@ int main(int argc, char *argv[]) {
   return 0;
 }
 #else // BUILD_SO
-#include <stdio.h>
+#  include <stdio.h>
 void fn() { printf("DSO function called successfully\n"); }
 #endif

``````````

</details>


https://github.com/llvm/llvm-project/pull/208358