[llvm] [flang] [clang] [clang-tools-extra] [flang] Add EXECUTE_COMMAND_LINE runtime and lowering intrinsics implementation (PR #74077)

[Yi Wu via cfe-commits]

================
@@ -173,5 +173,70 @@ RT_API_ATTRS void ShallowCopy(const Descriptor &to, const Descriptor &from) {
   ShallowCopy(to, from, to.IsContiguous(), from.IsContiguous());
 }
 
+RT_API_ATTRS const char *EnsureNullTerminated(
+    const char *str, size_t length, Terminator &terminator) {
+  if (length <= std::strlen(str)) {
----------------
yi-wu-arm wrote:

done, thank you for taking the time to review my code, especially during the holiday season! 

https://github.com/llvm/llvm-project/pull/74077