Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/ubsan/TestCases/Integer/mul-overflow.cpp

@@ -0,0 +1,14 @@
+// RUN: %clangxx -fsanitize=signed-integer-overflow %s -o %t && %run %t 2>&1 | FileCheck %s
+
+#include <stdint.h>
+
+int main() {
+  // These promote to 'int'.
+  (void)(int8_t(-2) * int8_t(0x7f));
+  (void)(int16_t(0x7fff) * int16_t(0x7fff));
+  (void)(uint16_t(0xffff) * int16_t(0x7fff));
+  (void)(uint16_t(0xffff) * uint16_t(0x8000));
+
+  // CHECK: mul-overflow.cpp:13:27: runtime error: signed integer overflow: 65535 * 32769 cannot be represented in type 'int'
+  (void)(uint16_t(0xffff) * uint16_t(0x8001));
+}