[clang] [mlir] [CIR] Implement 'noreturn' attribute for functions/calls. (PR #177978)

[Erich Keane via cfe-commits]

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@@ -39,6 +39,7 @@ def CIR_Dialect : Dialect {
     static llvm::StringRef getOptInfoAttrName() { return "cir.opt_info"; }
     static llvm::StringRef getCalleeAttrName() { return "callee"; }
     static llvm::StringRef getNoThrowAttrName() { return "nothrow"; }
+    static llvm::StringRef getNoReturnAttrName() { return "no_return"; }
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erichkeane wrote:

> One vote here for changing the MLIR LLVM dialect to not use that underscore

I agree, I already did so yesterday in 60fcfcbf0be58d4742c22e3949ceebb16beab0f4

Weirdly the commit line did something odd... but I switched EVERYTHING to use the `noreturn` spelling.

https://github.com/llvm/llvm-project/pull/177978