[clang] [libcxx] Allow string to use SSO in constant evaluation. (PR #66576)

[James Y Knight via cfe-commits]

================
@@ -880,7 +880,7 @@ public:
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 basic_string()
       _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
       : __r_(__default_init_tag(), __default_init_tag()) {
-    __default_init();
+    __r_.first() = __rep();
----------------
jyknight wrote:

Done.

https://github.com/llvm/llvm-project/pull/66576
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