[clang] [llvm] Triple: Forward declare Twine and remove include (PR #145685)

[Nikita Popov via cfe-commits]

================
@@ -349,7 +350,12 @@ class Triple {
   /// triple fields unknown.
   Triple() = default;
 
+  LLVM_ABI explicit Triple(std::string &&Str);
----------------
nikic wrote:

Probably my C++-foo is not strong enough, but I thought that doing a by-value pass + std::move gives you the same behavior (i.e. temporary or std::move argument doesn't get copied, everything else does).

https://github.com/llvm/llvm-project/pull/145685