arm: arm_dynarmic: Skip calls when JIT is invalid.

- This can happen if called from an idle or suspension thread.

src/core/arm/dynarmic/arm_dynarmic_32.cpp

@@ -251,10 +251,16 @@ void ARM_Dynarmic_32::SetTPIDR_EL0(u64 value) {
 }
 
 void ARM_Dynarmic_32::ChangeProcessorID(std::size_t new_core_id) {
+    if (!jit) {
+        return;
+    }
     jit->ChangeProcessorID(new_core_id);
 }
 
 void ARM_Dynarmic_32::SaveContext(ThreadContext32& ctx) {
+    if (!jit) {
+        return;
+    }
     Dynarmic::A32::Context context;
     jit->SaveContext(context);
     ctx.cpu_registers = context.Regs();
@@ -264,6 +270,9 @@ void ARM_Dynarmic_32::SaveContext(ThreadContext32& ctx) {
 }
 
 void ARM_Dynarmic_32::LoadContext(const ThreadContext32& ctx) {
+    if (!jit) {
+        return;
+    }
     Dynarmic::A32::Context context;
     context.Regs() = ctx.cpu_registers;
     context.ExtRegs() = ctx.extension_registers;
@@ -273,6 +282,9 @@ void ARM_Dynarmic_32::LoadContext(const ThreadContext32& ctx) {
 }
 
 void ARM_Dynarmic_32::PrepareReschedule() {
+    if (!jit) {
+        return;
+    }
     jit->HaltExecution();
 }
 

src/core/arm/dynarmic/arm_dynarmic_64.cpp

@@ -290,10 +290,16 @@ void ARM_Dynarmic_64::SetTPIDR_EL0(u64 value) {
 }
 
 void ARM_Dynarmic_64::ChangeProcessorID(std::size_t new_core_id) {
+    if (!jit) {
+        return;
+    }
     jit->ChangeProcessorID(new_core_id);
 }
 
 void ARM_Dynarmic_64::SaveContext(ThreadContext64& ctx) {
+    if (!jit) {
+        return;
+    }
     ctx.cpu_registers = jit->GetRegisters();
     ctx.sp = jit->GetSP();
     ctx.pc = jit->GetPC();
@@ -305,6 +311,9 @@ void ARM_Dynarmic_64::SaveContext(ThreadContext64& ctx) {
 }
 
 void ARM_Dynarmic_64::LoadContext(const ThreadContext64& ctx) {
+    if (!jit) {
+        return;
+    }
     jit->SetRegisters(ctx.cpu_registers);
     jit->SetSP(ctx.sp);
     jit->SetPC(ctx.pc);
@@ -316,6 +325,9 @@ void ARM_Dynarmic_64::LoadContext(const ThreadContext64& ctx) {
 }
 
 void ARM_Dynarmic_64::PrepareReschedule() {
+    if (!jit) {
+        return;
+    }
     jit->HaltExecution();
 }