i386: Fix up *testqi_ext_3 insn&split for the *testdi_1 changes [PR94088]

i386: Fix up *testqi_ext_3 insn&split for the *testdi_1 changes [PR94088]

In r10-1938-g460bf043c8266dd080308f4783137aee0d0f862c *testdi_1 has been
changed, so that if the mask has upper 32-bits 0 and then at least one bit
set, it requires CCZmode rather than CCNOmode, because in that case it uses
testl instruction rather than testq and so the SF flag wouldn't respect the
state of the 64-bit result.
The *testqi_ext_3 define_insn_and_split needs to match that though,
otherwise it can create an RTL pattern that used to match *testdi_1 but
doesn't anymore and we'd ICE due to an unrecognizable insn.

2020-03-10  Jakub Jelinek  <jakub@redhat.com>

	PR target/94088
	* config/i386/i386.md (*testqi_ext_3): Call ix86_match_ccmode with
	CCZmode instead of CCNOmode if operands[2] has DImode and pos + len
	is 32.

	* gcc.target/i386/pr94088.c: New test.