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

[Karl-Johan Karlsson 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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karka228 wrote:

The only reason for using `-O3`  was to get rid of all the allocas, loads and stores in the output that didn't contributed to the test.

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