[ARM][ARMLoadStoreOptimizer]
- The load store optimizer is currently merging multiple loads/stores into VLDM/VSTM with more than 16 doubleword registers
- This is an UNPREDICTABLE instruction and shouldn't be done
- It looks like the Limit for how many registers included in a merge got dropped at some point so I am reintroducing it in this patch
- This fixes https://bugs.llvm.org/show_bug.cgi?id=38389
Differential Revision: https://reviews.llvm.org/D52085
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342872
91177308-0d34-0410-b5e6-
96231b3b80d8
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