[PATCH v2 2/2] Fixes TCG generation for sh4 `fipr` and `ftrv` instructions.

[Randy Schifflin]

Updates the current logic for these instructions to check the
FPSCR register appropriately (according to the sh4 cpu manual, `fipr`
and `ftrv` are only defined when the FPSCR register PR flag is 0).
Also fixes the mth/nth-vector operands by multiplying by 4 to convert
to the correct floating point register offset.

Signed-off-by: Randy Schifflin <randy.schiff...@gmail.com>

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2.43.0