[testsuite] scanasm.exp: Fix target-selector handling in check-function-bodies

{target { ! a } } does not work because the greedy regexp extracts
"! a }" instead of "target { ! a }".

This patch replaces it with a non-greedy regexp.

2020-04-09  Christophe Lyon  <christophe.lyon@linaro.org>

	* lib/scanasm.exp (check-function-bodies): Use non-greedy regexp
	when extracting the target selector.

gcc/testsuite/ChangeLog

+2020-04-09  Christophe Lyon  <christophe.lyon@linaro.org>
+
+	* lib/scanasm.exp (check-function-bodies): Use non-greedy regexp
+	when extracting the target selector.
+
 2020-04-09  Martin Jambor  <mjambor@suse.cz>
 
 	PR tree-optimization/94482

gcc/testsuite/lib/scanasm.exp

@@ -689,7 +689,7 @@ proc check-function-bodies { args } {
 	if { [string equal -length $prefix_len $line $prefix] } {
 	    set line [string trim [string range $line $prefix_len end]]
 	    if { !$in_function } {
-		if { [regexp "^(.*\\S)\\s+{(.*)}\$" $line dummy \
+		if { [regexp "^(.*?\\S)\\s+{(.*)}\$" $line dummy \
 			  line selector] } {
 		    set selector [dg-process-target $selector]
 		} else {