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Improve long vector sext/zext lowering on ARM
The ARM backend currently has poor codegen for long sext/zext operations, such as v8i8 -> v8i32. This patch addresses this by performing a custom expansion in ARMISelLowering. It also adds/changes the cost of such lowering in ARMTTI. This partially addresses PR14867. Patch by Pete Couperus git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177380 91177308-0d34-0410-b5e6-96231b3b80d8
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