[clang-tools-extra] [libc++] Prevent calling the projection more than three times (PR #66315)

[via cfe-commits]

================
@@ -37,9 +37,10 @@ struct __fn {
     _LIBCPP_ASSERT_UNCATEGORIZED(!bool(std::invoke(__comp, std::invoke(__proj, 
__high), std::invoke(__proj, __low))),
                                  "Bad bounds passed to std::ranges::clamp");
 
-    if (std::invoke(__comp, std::invoke(__proj, __value), std::invoke(__proj, 
__low)))
+    auto&& __projected = std::invoke(__proj, __value);
----------------
EricWF wrote:

This could dangle. 

https://github.com/llvm/llvm-project/pull/66315
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