[llvm] DAG: Fix ABI lowering with FP promote in strictfp functions (PR #74405)

[Simon Pilgrim via llvm-commits]

================
@@ -1,22 +1,47 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
 ; FIXME: Missing operand promote for f16
----------------
RKSimon wrote:

Still need the FIXME?

https://github.com/llvm/llvm-project/pull/74405