shader: Fix MOV(reg), add SHL variants and emit neg and abs instructions

src/shader_recompiler/backend/spirv/emit_spirv.h

@@ -181,8 +181,8 @@ void EmitIAdd64(EmitContext& ctx);
 Id EmitISub32(EmitContext& ctx, Id a, Id b);
 void EmitISub64(EmitContext& ctx);
 Id EmitIMul32(EmitContext& ctx, Id a, Id b);
-void EmitINeg32(EmitContext& ctx);
-void EmitIAbs32(EmitContext& ctx);
+Id EmitINeg32(EmitContext& ctx, Id value);
+Id EmitIAbs32(EmitContext& ctx, Id value);
 Id EmitShiftLeftLogical32(EmitContext& ctx, Id base, Id shift);
 void EmitShiftRightLogical32(EmitContext& ctx);
 void EmitShiftRightArithmetic32(EmitContext& ctx);

src/shader_recompiler/backend/spirv/emit_spirv_integer.cpp

@@ -58,12 +58,12 @@ Id EmitIMul32(EmitContext& ctx, Id a, Id b) {
     return ctx.OpIMul(ctx.U32[1], a, b);
 }
 
-void EmitINeg32(EmitContext&) {
-    throw NotImplementedException("SPIR-V Instruction");
+Id EmitINeg32(EmitContext& ctx, Id value) {
+    return ctx.OpSNegate(ctx.U32[1], value);
 }
 
-void EmitIAbs32(EmitContext&) {
-    throw NotImplementedException("SPIR-V Instruction");
+Id EmitIAbs32(EmitContext& ctx, Id value) {
+    return ctx.OpSAbs(ctx.U32[1], value);
 }
 
 Id EmitShiftLeftLogical32(EmitContext& ctx, Id base, Id shift) {

src/shader_recompiler/frontend/maxwell/translate/impl/integer_shift_left.cpp

@@ -56,12 +56,12 @@ void SHL(TranslatorVisitor& v, u64 insn, const IR::U32& unsafe_shift) {
 }
 } // Anonymous namespace
 
-void TranslatorVisitor::SHL_reg(u64) {
-    throw NotImplementedException("SHL_reg");
+void TranslatorVisitor::SHL_reg(u64 insn) {
+    SHL(*this, insn, GetReg20(insn));
 }
 
-void TranslatorVisitor::SHL_cbuf(u64) {
-    throw NotImplementedException("SHL_cbuf");
+void TranslatorVisitor::SHL_cbuf(u64 insn) {
+    SHL(*this, insn, GetCbuf(insn));
 }
 
 void TranslatorVisitor::SHL_imm(u64 insn) {

src/shader_recompiler/frontend/maxwell/translate/impl/move_register.cpp

@@ -26,7 +26,7 @@ void MOV(TranslatorVisitor& v, u64 insn, const IR::U32& src, bool is_mov32i = fa
 } // Anonymous namespace
 
 void TranslatorVisitor::MOV_reg(u64 insn) {
-    MOV(*this, insn, GetReg8(insn));
+    MOV(*this, insn, GetReg20(insn));
 }
 
 void TranslatorVisitor::MOV_cbuf(u64 insn) {