[llvm] [InstCombine] Treat `asin`, `asinh`, `atan`, `atan2` and `cbrt` as odd-functions (PR #227336)

[via llvm-commits]

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@@ -11,7 +16,9 @@ declare void @use(double) nounwind
 define double @test_erf(double %x) {
 ; CHECK-LABEL: define double @test_erf(
 ; CHECK-SAME: double [[X:%.*]]) {
-; CHECK-NEXT:    [[RES:%.*]] = tail call reassoc double @erf(double [[X]])
+; CHECK-NEXT:    [[NEG_X:%.*]] = fneg double [[X]]
+; CHECK-NEXT:    [[RES1:%.*]] = tail call reassoc double @erf(double [[NEG_X]])
+; CHECK-NEXT:    [[RES:%.*]] = fneg double [[RES1]]
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suogesi wrote:

I've run `make check-llvm` and found `atan2` is not working as I imaginated. I hope this time it is as expected.

https://github.com/llvm/llvm-project/pull/227336