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Fix segfault accessing menvcfg when U-mode doesn't exist
The simplest fix is to create the CSRs even if they don't need to exist, and just skip adding them to the CSR map to prevent the target machine from being able to access them. It looks like there are other place we should be following this pattern: e.g. why does sstatus exist if S-mode does not exist? But that's a matter for another day. Resolves #1752
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