PR target/106450: Tweak timode_remove_non_convertible_regs on x86_64.

This patch resolves PR target/106450, some more fall-out from more
aggressive TImode scalar-to-vector (STV) optimizations.  I continue
to be caught out by how far TImode STV has diverged from DImode/SImode
STV, and therefore requires additional (unexpected) tweaking.  Many
thanks to H.J. Lu for pointing out timode_remove_non_convertible_regs
needs to be extended to handle XOR (and other new operations).

Unhelpfully the comment above this function states that it's the TImode
version of "remove_non_convertible_regs", which doesn't exist anymore,
so I've resurrected an explanatory comment from the git history.
By refactoring the checks for hard regs and already "marked" regs
into timode_check_non_convertible_regs itself, all of its callers are
simplified.  This patch then FOR_EACH_INSN_USE and FOR_EACH_INSN_DEF
to generically handle arbitrary (non-move) instructions (including
unary and binary operations), calling timode_check_non_convertible_regs
on each TImode register USE and DEF.

2022-07-31  Roger Sayle  <roger@nextmovesoftware.com>
	    H.J. Lu  <hjl.tools@gmail.com>

gcc/ChangeLog
	PR target/106450
	* config/i386/i386-features.cc (timode_check_non_convertible_regs):
	Do nothing if REGNO is set in the REGS bitmap, or is a hard reg.
	(timode_remove_non_convertible_regs): Update comment.
	Call timode_check_non_convertible_reg on all TImode register
	DEFs and USEs in each instruction.

gcc/testsuite/ChangeLog
	PR target/106450
	* gcc.target/i386/pr106450.c: New test case.

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