fix asm-not pattern in dwarf2/inline5.c

fix asm-not pattern in dwarf2/inline5.c

The test is supposed to check that the abstract lexical block of a
function that was inlined doesn't have attributes, and that the
concrete inlined lexical block does.

There are two patterns to verify the absence of attributes in the
abstract lexical block, one for the case in which the concrete block
appears after the abstract one, and another for the case in which it's
before.

The former has a problem that is not visible when asm comments start
with a single character, but that becomes apparent when they start
with "/ ".

The pattern starts by matching the abstract DW_TAG_lexical_block DIE
header, and checking that the next line has, after any of the
comment-starter characters (e.g. '/'), there are one or more blanks '
+', and then a character other than the '(' that would start another
DIE.

The problem is that '[.../...]+ +[^(].*' matches '/  (DIE...', because
'[^(]' may match the second blank, and after that anything goes.  So
we end up recognizing the pattern, as if it was an abstract lexical
block with an attribute.

This could be minimally fixed by changing '[^(]' to '[^ (]', but the
pattern that matches concrete before abstract checks for an explicit
DW_AT after the abstract DIE, so I'm using that in the other pattern
as well.

For reference, the lines that start the unwanted match are:
	.uleb128 0xc	/  (DIE (0xa4) DW_TAG_lexical_block)
	.uleb128 0xd	/  (DIE (0xa5) DW_TAG_variable)

for  gcc/testsuite/ChangeLog

	* gcc.dg/debug/dwarf2/inline5.c: Adjust pattern to avoid
	mismatch when asm comments start with "/ ".