Log Message:
libretro-pcsx-rearmed: Update to 20200526

Changes:

     * Update lightrec to latest upstream
     * Minimize logs when loading a cheevos-compatible content
     * Cleanup retro_run() -
       - move input query into separate functions
       - move internal fps display to separate function
     * Hide other inputs from core options -
       - This adds a core option to hide some input options like
       multitaps, player ports 3-8 and analog-related fine-tuning options.
       - also combine dynarec-only options in one #define directive
     * More core option fixes -
       - This PR fixes core options and moves them to the related dynarec
       modes where they are implemented.
       LIGHTREC = relates to platforms that supports the new Lightrec mode
       NEW_DYNAREC = relates to previous dynarec implementation that is
       still used for some 32bit devices
       - Dynarec Recompiler core option, both dynarec implementation can
       be enabled or disabled
     * Move guncon options to update_variables -
       - This should stop unnecessary RETRO_ENVIRONMENT_GET_VARIABLE
       callback and log spamming
     * Fix some edge case where core can freeze upon loading content
     * Automatically disable Lightrec when no BIOS is present, take 2
     * cdriso: fix a disk switching deadlock when closing a CD image
     * ARM NEON: Fixed bug where MSB of a 15-bit BGR color could corrupt
       green value.
     * cdriso: fix a disk switching deadlock
     * unai: Add ARM-optimized lighting / blending functions

   Addendum on UNAI ARM-optimized lighting/blending improvements -

   "Looking at the generated ASM on 3DS, I thought I could squeeze out
   some extra performance by moving the inner lighting and blending
   functions to handwritten A32 assembly. This gives a medium improvement
   generally (3-5fps faster on the beach in Crash 1) and a large
   improvement when doing lots of blending (46-48fps before, 57-60fps
   after, behind the waterfall in Water Dragon Isle in Chrono Cross).

   Some other notes:
     * I used the ARM11 MPCore (3DS CPU) timings for pipelining.
     * I had a few stall cycles during lighting, so I used them to
       preserve the MSB for lighting and blending, which saved a store,
       load, and orr later on. ~3-6 cycles saved overall by doing that.
     * I switched from u16 to uint_fast16_t, which is 32-bit on this
       platform. This saved a few useless uxth instructions for another
       few cycles. This shouldn't affect other platforms, but I don't know
       for sure. Could typedef if necessary.
     * A lot of the speed improvement in blending comes from not using two
       instructions per and. For example, & 0x8000 -- the compiler
       preferred to mask out bytes using bic 0x7F00 and bic 0x00FF. Both
       slower and seemed less correct for what we're trying to do."