[clang] [flang] [flang] Update -falias-analysis help text (PR #73548)

[Andrzej Warzyński via cfe-commits]

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@@ -6334,8 +6334,8 @@ defm loop_versioning : BoolOptionWithoutMarshalling<"f", "version-loops-for-stri
   PosFlag<SetTrue, [], [ClangOption], "Create unit-strided versions of loops">,
    NegFlag<SetFalse, [], [ClangOption], "Do not create unit-strided loops (default)">>;
 defm alias_analysis : BoolOptionWithoutMarshalling<"f", "alias-analysis",
-  PosFlag<SetTrue, [], [], "Pass alias information on to LLVM (default when optimizing for speed)">,
-  NegFlag<SetFalse, [], [], "Do not pass alias information on to LLVM (default for unoptimized builds)">>;
+  PosFlag<SetTrue, [], [], "Pass alias information on to LLVM (default when optimizing for speed). Overrides -O0.">,
+  NegFlag<SetFalse, [], [], "Do not pass alias information on to LLVM (default for unoptimized builds). Overrides -O flags.">>;
 } // let Visibility = [FC1Option, FlangOption]
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banach-space wrote:

Perhaps restrict to `FC1Option`?

https://github.com/llvm/llvm-project/pull/73548