https://issues.dlang.org/show_bug.cgi?id=20017

          Issue ID: 20017
           Summary: JSON (-X) compilerInfo.architectures generation
                    depends on params.isXXX for CPU detection
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: ibuclaw@gdcproject.org

These parameters will eventually become private to dmd/target.d, there is also no way for an interfacing compiler backend to add their own architectures (e.g: ARM, PowerPC, RISC-V, SystemZ, ...)

Also makes an incorrect use of version(X86), as that is only evaluated on the
host, not the target.

if (global.params.is64bit)
    item("x86_64");
else
    version(X86) item("x86");

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