externals: Update dynarmic to 4e6848d

4e6848d A32/ir_emitter: Bugfix: ExceptionRaised was producing incorrect PC
41ba9fd value: Move ImmediateToU64() to be a part of Value's interface
c6a6271 reg_alloc: Emit AVX instructions where able
aedd32a abi: Emit AVX instructions where able
f2d9337 a64_exclusive_monitor: Loosen memory ordering requirements
7ca709d travis: Make macOS builds use Xcode 10
14dd45e Fix VShift terminology
88554c4 emit_x64_vector: AVX512 implementation of EmitVectorLogicalVShiftS16
ab4e316 emit_x64_vector: AVX512 implementation of EmitVectorLogicalVShiftS64
0ea84f3 emit_x64_vector: AVX2 implementation of EmitVectorLogicalVShiftS32
c77a2c5 emit_x64_vector: AVX512 implementation of EmitVectorLogicalVShiftU16()
e9441fd emit_x64_vector: AVX2 implementation of EmitVectorLogicalVShiftU64()
0e9c33c emit_x64_vector: AVX2 implementation of EmitVectorLogicalVShiftU32()
8f85274 emit_x64_vector: SSSE3 variant of EmitVectorCountLeadingZeros8()
be05e75 Merge pull request #397 from VelocityRa/dec-shift-fix
bc328fc decoders: Cast to correctly-sized type before shifting
9c3d2d1 a64_emit_x64: Lowercase PAGE_SIZE
f538d29 emit_x64_vector_floating_point: SSE4.1 implementation of EmitFPVectorToFixed
1603a6e emit_x64_vector_floating_point: EmitFPVectorRoundInt: Use FCODE
2e1ccaf emit_x64_vector: AVX implementation for EmitVectorCountLeadingZeros8
555bfda emit_x64_vector: SSE implementation of EmitVectorCountLeadingZeros16
71c2589 externals: Update Xbyak to 5.73
1ec1b2f Squashed 'externals/xbyak/' changes from 1de435ed..42462ef9