[llvm] Remove SDNPSideEffect from ARMcallseq_start and ARMcallseq_end (NFC) (PR #153248)

[via llvm-commits]

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@@ -2203,10 +2202,6 @@ def JUMPTABLE_TBH :
 PseudoInst<(outs), (ins cpinst_operand:$instid, cpinst_operand:$cpidx,
                         i32imm:$size), NoItinerary, []>;
 
-
-// FIXME: Marking these as hasSideEffects is necessary to prevent machine DCE
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AZero13 wrote:

We don't have it in AArch64 despite that also having it too. 

https://github.com/llvm/llvm-project/pull/153248