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Improve save state efficiency + fix save state size

Use audio batch callback only once per frame

PS3/PSL1GHT Makefile.libretro update

Use the gcc built-in function, making the operation constant-time and
branch-free.

Use {READ,WRITE}_WORD so that it copies by word on little-endian
platforms. Mark a LUT const for const-correctness.

Fix regression introduced in snes9x-1.40.

Avoids recreating the arrays on the stack on every entry to the function
and moves them to the ro section. For dsp, this is a performance
regression introduced in snes9x-1.52 when the const arrays moved to
function scope.

Fix the build with `armv` platform

Replace direct direct file access with VFS routines

Added rpi3_64 to makefile

Assign map descriptors after ROM is loaded

Increase SRAM size

Moved the assignment of map.descriptors and map.num_descriptors
until after the ROM is loaded.  Since the descriptors are initialized as
part of loading the ROM, assigning these struct members prior to loading
the ROM meant that retroarch would never see any memory maps.  After
this change, I can see the maps in the retroarch log output, as
expected.

Increased SRAM size from 128KB to 512KB. This fixes a crash in the
Super Metroid Practice Hack when saving/loading state.

This reverts commit 988fa23d.

This reverts commit 75139261.

that don't support it)

Fix build with clang

-flto=auto is gcc specific and fails under clang