JitArm64: Fix clobbering LR in FakeLKExit

Fixes Need for Speed: Carbon accessing invalid memory when
branch following and BLR optimization are enabled simultaneously.

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

@@ -398,6 +398,7 @@ void JitArm64::FakeLKExit(u32 exit_address_after_return)
 
   // We may need to fake the BLR stack on inlined CALL instructions.
   // Else we can't return to this location any more.
+  gpr.Lock(ARM64Reg::W30);
   ARM64Reg after_reg = gpr.GetReg();
   ARM64Reg code_reg = gpr.GetReg();
   MOVI2R(after_reg, exit_address_after_return);
@@ -406,6 +407,7 @@ void JitArm64::FakeLKExit(u32 exit_address_after_return)
   gpr.Unlock(after_reg, code_reg);
 
   FixupBranch skip_exit = BL();
+  gpr.Unlock(ARM64Reg::W30);
 
   // Write the regular exit node after the return.
   JitBlock* b = js.curBlock;