[AArch64][GlobalISel] Add manual selection support for G_ZEXTLOADs to s64.
We already get support for G_ZEXTLOAD to s32 from the importer, but it can't
deal with the SUBREG_TO_REG in the pattern. Tweaking the existing manual
selection code for G_LOAD to handle an additional SUBREG_TO_REG when dealing
with G_ZEXTLOAD isn't much work.
Also add tests to check the imported pattern selections to s32 work.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362681
91177308-0d34-0410-b5e6-
96231b3b80d8
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