Unnecessary multiple Register File write

Created by: pascalgouedo

Issue description

For some instructions (MULH, DIV) and depending of stalling cases for loads (aligned, misaligned, post-incr) , multiple Register File writes are done while not necessary.

Component

Component:RTL

Steps to Reproduce

makeuvmt SIMULATOR=vsim VSIM_USER_FLAGS=+fixed_data_gnt_stall=3 USER_RUN_FLAGS=+fixed_data_rvalid_stall=3 WAVES=YES TEST=power_issues_test test