gcc/ChangeLog: * doc/sourcebuild.texi: Document LRA target selector. gcc/testsuite/ChangeLog: PR testsuite/99292 * lib/target-supports.exp (check_effective_target_lra): New. * gcc.c-torture/compile/asmgoto-2.c: Use LRA target selector. * gcc.c-torture/compile/asmgoto-5.c: Likewise. * gcc.c-torture/compile/pr98096.c: Likewise. * gcc.dg/pr97954.c: Likewise.