Remove Unused Framestop Functions

[RisingFog]

These weren't actually being used for anything, so it only makes sense to remove them.

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This change is

[degasus]

As this was the last writing usage of PowerPC::GetStatePtr(), might you change it's definition to return a const pointer?
Else, LGTM

[degasus]

Reviewed 2 of 2 files at r1, 1 of 1 files at r2, 1 of 1 files at r3.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[degasus]

IMO ready for 5.0

[dolphin-emu-bot]

FifoCI detected that this change impacts graphical rendering. Here are the behavior differences detected by the system:

• hb-discgolf on ogl-lin-mesa: failed to render
• lesson08 on ogl-lin-mesa: failed to render
• rs3-bumpmapping on ogl-lin-mesa: failed to render
• sms-water on ogl-lin-mesa: failed to render

_{^{automated-fifoci-reporter}}