[compiler-rt] [asan] Add test for deferencing zero-sized malloc/calloc (PR #155933)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- compiler-rt/test/asan/TestCases/zero_alloc.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/compiler-rt/test/asan/TestCases/zero_alloc.cpp b/compiler-rt/test/asan/TestCases/zero_alloc.cpp
index 3decd5acb..832b35395 100644
--- a/compiler-rt/test/asan/TestCases/zero_alloc.cpp
+++ b/compiler-rt/test/asan/TestCases/zero_alloc.cpp
@@ -7,30 +7,30 @@
 
 int main(int argc, char **argv) {
   {
-     char* p1 = (char*)calloc(1, 0);
-     printf ("p1 is %p\n", p1);
-     printf ("Content of p1 is: %d\n", *p1);
-     // CHECK: ERROR: AddressSanitizer: heap-buffer-overflow
-     // CHECK: {{#0 0x.* in main .*zero_alloc.cpp:}}[[@LINE-2]]
-     free(p1);
+    char *p1 = (char *)calloc(1, 0);
+    printf("p1 is %p\n", p1);
+    printf("Content of p1 is: %d\n", *p1);
+    // CHECK: ERROR: AddressSanitizer: heap-buffer-overflow
+    // CHECK: {{#0 0x.* in main .*zero_alloc.cpp:}}[[@LINE-2]]
+    free(p1);
   }
 
   {
-     char* p2 = (char*)calloc(0, 1);
-     printf ("p2 is %p\n", p2);
-     printf ("Content of p2 is: %d\n", *p2);
-     // CHECK: ERROR: AddressSanitizer: heap-buffer-overflow
-     // CHECK: {{#0 0x.* in main .*zero_alloc.cpp:}}[[@LINE-2]]
-     free(p2);
+    char *p2 = (char *)calloc(0, 1);
+    printf("p2 is %p\n", p2);
+    printf("Content of p2 is: %d\n", *p2);
+    // CHECK: ERROR: AddressSanitizer: heap-buffer-overflow
+    // CHECK: {{#0 0x.* in main .*zero_alloc.cpp:}}[[@LINE-2]]
+    free(p2);
   }
 
   {
-     char* p3 = (char*)malloc(0);
-     printf ("p3 is %p\n", p3);
-     printf ("Content of p2 is: %d\n", *p3);
-     // CHECK: ERROR: AddressSanitizer: heap-buffer-overflow
-     // CHECK: {{#0 0x.* in main .*zero_alloc.cpp:}}[[@LINE-2]]
-     free(p3);
+    char *p3 = (char *)malloc(0);
+    printf("p3 is %p\n", p3);
+    printf("Content of p2 is: %d\n", *p3);
+    // CHECK: ERROR: AddressSanitizer: heap-buffer-overflow
+    // CHECK: {{#0 0x.* in main .*zero_alloc.cpp:}}[[@LINE-2]]
+    free(p3);
   }
 
   return 0;

``````````

</details>


https://github.com/llvm/llvm-project/pull/155933