DSP LLE JIT: Fix Update_SR_Register16_OverS32

There were 3 bugs here:

- The input register for the full register wasn't actually being used; it was read into RCX but RCX wasn't used by Update_SR_Register16_OverS32 (except as a scratch register).  The way the DSP LLE recompiler uses registers is in general confusing, so this commit changes a few uses to have a variable for the register being used, to make code a bit more readable.  (Default parameter values were also removed so that they needed to be explicitly specified).
- Update_SR_Register16 was doing a 64-bit test, when it should have been doing a 16-bit test.  For the most part this doesn't matter due to sign-extension, but it does come up with e.g. `ORI` or `ANDI`.
- Update_SR_Register16_OverS32 did the over s32 check, and then called Update_SR_Register16.  Update_SR_Register16 masks $sr with ~SR_CMP_MASK, clearing the over s32 bit.  Now the over s32 check is performed after calling Update_SR_Register16 (without masking a second time).  No official uCode cares about the over s32 bit.

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