[clang] [Driver] Introduce ffp-model=aggressive (PR #100453)

[Zahira Ammarguellat via cfe-commits]

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@@ -102,6 +102,17 @@ Deprecated Compiler Flags
 Modified Compiler Flags
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+- The ``-ffp-model`` option has been updated to enable a more limited set of
+  optimizations when the ``fast`` argument is used and to accept a new argument,
+  ``aggressive``. The behavior of ``-ffp-model=aggressive`` is mostly equivalent
+  to the previous behavior of ``-ffp-model=fast``. The updated
+  ``-ffp-model=fast`` behavior no longer assumes finite math only and uses a
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zahiraam wrote:

remove the 'a' at eol.

https://github.com/llvm/llvm-project/pull/100453