Remove disableJavaScriptJIT query knob

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      We always want Javascript JIT to be disabled for security reasons, so when performing a MozJS upgrade we generate platform-specific files always with the --disable-jit flag, which will define JS_CODEGEN_NONE as 1, effectively disabling all possibilities of executing JIT code, since it disables the JIT backend. Here's some more examples of JIT code being disabled by the definition:

      This means that setting the disableJavaScriptJIT parameter boils down to being a no-op, so we should get rid of it. We should also clean up code that references JIT, like here, as it makes it seem like JIT is actually doing something.

              Assignee:
              Mariano Shaar
              Reporter:
              Mariano Shaar
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