[llvm] [KnownFPClass] Add support for non-intrinsic math libcalls (PR #216234)

[Matt Arsenault via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
+; RUN: opt -aa-pipeline=basic-aa -passes=attributor -attributor-manifest-internal -S < %s | FileCheck %s
+
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arsenm wrote:

Can you add an explicit triple to each of these tests? Eventually I want to fix the historical mistake of assuming a random set of libcalls is available for an unknown OS 

https://github.com/llvm/llvm-project/pull/216234