[clang] [NFC] Add assertion to ensure FiniteMathOnly is in sync with HonorINFs and HonorNANs. (PR #97342)

[Aaron Ballman via cfe-commits]

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@@ -816,6 +816,11 @@ class FPOptions {
     setAllowFPReassociate(LO.AllowFPReassoc);
     setNoHonorNaNs(LO.NoHonorNaNs);
     setNoHonorInfs(LO.NoHonorInfs);
+    // Ensure that if FiniteMathOnly is enabled, NoHonorNaNs and NoHonorInfs are
+    // also enabled. This is because FiniteMathOnly mode assumes no NaNs or Infs
+    // are present in computations.
+    assert((LO.FiniteMathOnly == (LO.NoHonorInfs && LO.NoHonorNaNs)) &&
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AaronBallman wrote:

The `FiniteMathOnly` variable should be removed from `LangOptions` entirely at this point; the plan is to only rely on `NoHonorInfs` and `NoHonorNans` instead.

https://github.com/llvm/llvm-project/pull/97342