[clang] [clang][CUDA] Add 'noconvergent' function and statement attribute (PR #100637)

[Matt Arsenault via cfe-commits]

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@@ -1357,11 +1357,10 @@ of the condition.
 def ConvergentDocs : Documentation {
   let Category = DocCatFunction;
   let Content = [{
-The ``convergent`` attribute can be placed on a function declaration or a
-statement containing call expressions. It is translated into the LLVM
-``convergent`` attribute, which indicates that the call instructions of a
-function with this attribute cannot be made control-dependent on any additional
-values.
+The ``convergent`` attribute can be placed on a function declaration. It is
+translated into the LLVM ``convergent`` attribute, which indicates that the call
+instructions of a function with this attribute cannot be made control-dependent
+on any additional values.
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arsenm wrote:

Maybe should just deprecate this, since it's kind of useless 

https://github.com/llvm/llvm-project/pull/100637