cpu-o3: Fix minor style issue in rename_map.hh.
cpu-o3: Fix minor style issue in rename_map.hh.

Change-Id: I670e504320b41e38666dab6eb7a83e4a39bc3b00
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/49146
Reviewed-by: Giacomo Travaglini <8eef13a4f970e2e9372c8d26ad0737b760f99c02@arm.com>
Maintainer: Giacomo Travaglini <8eef13a4f970e2e9372c8d26ad0737b760f99c02@arm.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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