[clang] [clang][CodeGen] Propagate pragma set fast-math flags to floating point builtins (PR #90377)

[Zahira Ammarguellat via cfe-commits]

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+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 4
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -O3 -emit-llvm -o - %s \
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zahiraam wrote:

There is no need to use -O3 here to prove what you want, I think.

https://github.com/llvm/llvm-project/pull/90377