gdb/record: add support for floating point vunpck instructions

This commit adds support for the AVX instructions vunpck[l|h][ps|pd]
instructions, which was pretty straightforward.

This commit also fixes a mistake in the test, where "record stop" was
used after the recording was already stopped, if it failed during
vpunpck_test recording. It also improved the documentation at the start
of the relevant .c function.

Approved-By: Guinevere Larsen <guinevere@redhat.com>
3 files changed