S390: [simulator] Initial 2-level jump table implementation
The old switch-case instruction decode implementation results in a sparse table, which is not resolved by a fast jump table routing. Therefore, it is really slow in instruction decoding phase. R=joransiu@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com BUG= Review URL: https://codereview.chromium.org/1873963002 Cr-Commit-Position: refs/heads/master@{#35589}
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