Append ".p2align 4" to some x86 directive tests

Append ".p2align 4" to some x86 directive tests

Append ".p2align 4" to some x86 directive tests for explicit paddings
for section alignment to avoid implicit section alignment in assembler
listings.

	* testsuite/gas/i386/avx512vl-2.l: Append "#pass".
	* testsuite/gas/i386/noavx-1.l: Likewise.
	* testsuite/gas/i386/nommx-1.l: Likewise.
	* testsuite/gas/i386/nosse-1.l: Likewise.
	* testsuite/gas/i386/x86-64-avx512vl-2.l: Likewise.
	* testsuite/gas/i386/avx512vl-2.s: Append ".p2align 4".
	* testsuite/gas/i386/noavx-1.s: Likewise.
	* testsuite/gas/i386/nommx-1.s: Likewise.
	* testsuite/gas/i386/nosse-1.s: Likewise.
	* testsuite/gas/i386/x86-64-avx512vl-2.s: Likewise.