fix stpcpy as well

Author: michaelrj-google

libc/src/string/CMakeLists.txt

@@ -87,7 +87,6 @@ add_entrypoint_object(
   HDRS
     stpcpy.h
   DEPENDS
-    .mempcpy
     .string_utils
 )
 

libc/src/string/stpcpy.cpp

@@ -8,7 +8,7 @@
 
 #include "src/string/stpcpy.h"
 #include "src/__support/macros/config.h"
-#include "src/string/mempcpy.h"
+#include "src/string/memory_utils/inline_memcpy.h"
 #include "src/string/string_utils.h"
 
 #include "src/__support/common.h"
@@ -18,8 +18,8 @@ namespace LIBC_NAMESPACE_DECL {
 LLVM_LIBC_FUNCTION(char *, stpcpy,
                    (char *__restrict dest, const char *__restrict src)) {
   size_t size = internal::string_length(src) + 1;
-  char *result =
-      reinterpret_cast<char *>(LIBC_NAMESPACE::mempcpy(dest, src, size));
+  inline_memcpy(dest, src, size);
+  char *result = dest + size;
 
   if (result != nullptr)
     return result - 1;