[clang] [analyzer] Model overflow builtins (PR #102602)

[Pavel Skripkin via cfe-commits]

================
@@ -278,6 +278,23 @@ int *mallocRegion(void) {
   return mem;
 }
 
+int *custom_calloc(size_t a, size_t b) {
+  size_t res;
+  if (__builtin_mul_overflow(a, b, &res))
+    return 0;
+
+  return malloc(res);
+}
+
+int *mallocRegionOverflow(void) {
+  int *mem = (int*)custom_calloc(4, 10);
+
+  mem[20] = 10;
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pskrgag wrote:

Thanks for note! I've just copy-pasted logic from tests above =)

https://github.com/llvm/llvm-project/pull/102602