x86 entry code updates:

    - Convert the 32bit syscalls to be pt_regs based which removes the
      requirement to push all 6 potential arguments onto the stack and
      consolidates the interface with the 64bit variant

    - The first small portion of the exception and syscall related entry
      code consolidation which aims to address the recently discovered
      issues vs. RCU, int3, NMI and some other exceptions which can
      interrupt any context. The bulk of the changes is still work in
      progress and aimed for 5.8.

    - A few lockdep namespace cleanups which have been applied into this
      branch to keep the prerequisites for the ongoing work confined.
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