bd1a3f1a7e
frstor can trap despite it being a control instruction, since it bogusly checks for pending exceptions in the state that it is overwriting. This used to be a non-problem because frstor was always paired with a previous fnsave, and fnsave does an implicit fninit so any pending exceptions only remain live in the saved state. Now frstor is sometimes paired with npxdrop() and we must do a little more than just forget that the npx was used in npxdrop() to avoid a trap later. This is a non-problem in the FXSR case because fxrstor doesn't do the bogus check. FXSR is part of SSE, and npxdrop() is only in FreeBSD-5.x, so this bug only affected old machines running FreeBSD-5.x. PR: 68058
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