[ARM] Restore STRICT FP setup, byval pre-load fix, bundle predicate A prior rebase conflict resolution accidentally dropped several unrelated pieces of upstream ARM code: - ARMISelLowering: STRICT_FP_ROUND/FMINNUM/FMAXNUM/FP_EXTEND setOperationAction calls (from d08b0f7240aa "Disable strict node mutation"), the STRICT_FP_TO_SINT/UINT i32 unconditional setup, the STRICT_FP16_TO_FP Expand fallback (reverted from LibCall), the byval pre-load fix in LowerCall (from a01a921004c1), and the IsStrictFPEnabled=true line at the end of the constructor. - ARMTargetMachine: broadened createUnpackMachineBundlesLegacy from the Thumb2/KCFI predicate to nullptr (unconditional). These deletions caused CHECK-line mismatches in fp16-fullfp16.ll, fp-intrinsics-vector.ll, and byval_struct_copy_tailcall.ll. None of the affected tests use llvm.ct.select. Restores the upstream code verbatim; ct.select work is unaffected.
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