JitArm64: Allow DoJit at address 0 (fix launching Wii titles)

JitArm64::DoJit contains a check where it prints a warning and tries
to pause emulation if instructed to compile code at address 0. I'm
assuming this was done in order to provide a nicer error behavior
in cases where PC was accidentally set to null. Unfortunately, it
has started causing us problems recently, as 688bd61 writes and runs
some code at address 0 to simulate the PPC being held in reset.
What makes this worse is that calling Core::SetState from the CPU
thread is actually not allowed and will cause a deadlock instead of
the intended behavior. I don't believe there is anything on a real
console that would stop you from executing code at address 0 (as
long as the MMU has been set up to allow it), and Jit64::DoJit
doesn't contain any check like this, so let's remove the check.

Source/Core/Core/PowerPC/JitArm64/Jit.cpp

@@ -623,12 +623,6 @@ void JitArm64::Jit(u32)
 
 void JitArm64::DoJit(u32 em_address, JitBlock* b, u32 nextPC)
 {
-  if (em_address == 0)
-  {
-    Core::SetState(Core::State::Paused);
-    WARN_LOG_FMT(DYNA_REC, "ERROR: Compiling at 0. LR={:08x} CTR={:08x}", LR, CTR);
-  }
-
   js.isLastInstruction = false;
   js.firstFPInstructionFound = false;
   js.assumeNoPairedQuantize = false;