[WebAssembly][NFC] Move SIMD encoding tests to dedicated file
Summary:
This change makes the tests more focused and avoids problematic
interactions between the testing modes and instruction encoding. This
change also allows the other tests to use less verbose output and
stricter checks.
Reviewers: aheejin, dschuff, aardappel
Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits
Differential Revision: https://reviews.llvm.org/D52007
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342287
91177308-0d34-0410-b5e6-
96231b3b80d8
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