dynarmic: Update to 12a1020

12a1020 emit_X64_floating_point: Near jmp to end instead of short jmp
6278f83 emit_x64_vector: Fix typo in VectorShuffleImpl
25a0204 A64: Implement REV64
aa92e33 bit_util: Do nothing in RotateRight if the rotation amount is zero
e537985 A64: Implement REV32 (vector)
f62a258 ir: Add IR opcodes for emitting vector shuffles
36ac6ec emit_x64_vector_floating_point: Fix out of bounds array access in EmitVectorOperation64
20a59a9 A64: Implement REV16 (vector)
b2f7bb0 CMakeLists: Add fp_util, macro_util and math_util headers
fd21b58 A64: Implement EOR3 and BCAX
a48c0bb travis: Use yuzu's unicorn fork
59e62e0 externals: Update catch to v2.2.1