[clang] Mechanically port bulk of x86 builtins to TableGen (PR #120831)

[Chandler Carruth via cfe-commits]

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@@ -108,9 +109,15 @@ class PrototypeParser {
     } else if (T.consume_back("&")) {
       ParseType(T);
       Type += "&";
+    } else if (T.consume_front("long long")) {
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chandlerc wrote:

Not sure -- the vast majority of x86 builtins use `O` for this.

It's a no-op on targets without OpenCL support, but it seems harmless there.

https://github.com/llvm/llvm-project/pull/120831