[llvm-branch-commits] [llvm] [LLVM][Coroutines] Create `.noalloc` variant of switch ABI coroutine ramp functions during CoroSplit (PR #99283)

[Chuanqi Xu via llvm-branch-commits]

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@@ -2049,6 +2055,21 @@ the coroutine must reach the final suspend point when it get destroyed.
 
 This attribute only works for switched-resume coroutines now.
 
+coro_elide_safe
+---------------
+
+When a Call or Invoke instruction is marked with `coro_elide_safe`,
+CoroAnnotationElidePass performs heap elision when possible. Note that for
+recursive or mutually recursive functions this elision is usually not possible.
+
+coro_gen_noalloc_ramp
+---------------------
+
+This attribute hints CoroSplitPass to generate a `f.noalloc` ramp function for
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ChuanqiXu9 wrote:

It will be better to explain and describe the `f.noalloc` ramp function  in this document. And it will be better to have some  example codes for it and compare it with the normal ramp functions.

https://github.com/llvm/llvm-project/pull/99283