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

[Nikolas Klauser via cfe-commits]

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@@ -349,7 +350,12 @@ class Triple {
   /// triple fields unknown.
   Triple() = default;
 
+  LLVM_ABI explicit Triple(std::string &&Str);
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philnik777 wrote:

That is indeed the case. Technically there is an additional `move`, OTOH that pretty much never matters, since the optimizer is almost always perfectly capable of removing that.

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