[llvm] [llvm] Ensure that soft float targets don't emit `fma()` libcalls. (PR #106615)

[Matt Arsenault via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -mtriple=arm --fp-contract off < %s | FileCheck %s -check-prefix=SOFT-FLOAT-FPC-OFF
+; RUN: llc -mtriple=arm --fp-contract on < %s | FileCheck %s -check-prefix=SOFT-FLOAT-FPC-ON
+; RUN: llc -mtriple=arm --fp-contract fast < %s | FileCheck %s -check-prefix=SOFT-FLOAT-FPC-FAST
+; RUN: llc -mtriple=arm -mattr=+vfp4d16sp --fp-contract off < %s | FileCheck %s -check-prefix=SOFT-FLOAT-VFP32-FPC-OFF
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arsenm wrote:

Avoid adding new uses of the fp-contract flag, and prefer explicit contract flags in the IR 

https://github.com/llvm/llvm-project/pull/106615