testsuite: Handle double-quoted LTO section names [PR112728]

testsuite: Handle double-quoted LTO section names [PR112728]

The gcc.dg/scantest-lto.c test FAILs on Solaris/SPARC with the native as:

FAIL: gcc.dg/scantest-lto.c scan-assembler-not ascii
FAIL: gcc.dg/scantest-lto.c scan-assembler-times ascii 0

It requires double-quoting the section name which scanasm.exp doesn't
allow for.

This patch fixes that.

Tested on sparc-sun-solaris2.11 (as and gas) and i386-pc-solaris2.11 (as
and gas).

2023-11-23  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc/testsuite:
	PR testsuite/112728
	* lib/scanasm.exp (dg-scan): Allow for double-quoted LTO section names.
	(scan-assembler-times): Likewise.
	(scan-assembler-dem-not): Likewise.