gotest: accept symbols with leading dot

On AIX nm displays symbols with a leading dot; don't discard such
    symbols.
    
    While we're here stop doing fgrep -v '$', symbol names no longer
    contain '$' anyhow.
    
    Reviewed-on: https://go-review.googlesource.com/91095

From-SVN: r257247

gcc/go/gofrontend/MERGE

@@ -1,4 +1,4 @@
-973ae0a30c17e736f57377fa32371719b9ebccf6
+00f87806635655339dbbca59e6ae2ea8231cf9b1
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/testsuite/gotest

@@ -518,18 +518,18 @@ localname() {
 	pattern='Test([^a-z].*)?'
 	# The -p option tells GNU nm not to sort.
 	# The -v option tells Solaris nm to sort by value.
-	tests=$($NM -p -v _gotest_.o $xofile | egrep " $text .*\."$pattern'$' | grep -v '\..*\.' | fgrep -v '$' | fgrep -v ' __go_' | sed 's/.* //' | $symtogo)
+	tests=$($NM -p -v _gotest_.o $xofile | egrep " $text .*\."$pattern'$' | grep -v '[^ ]\..*\.' | fgrep -v ' __go_' | sed 's/.* //' | $symtogo)
 	if [ "x$tests" = x ]; then
 		echo 'gotest: warning: no tests matching '$pattern in _gotest_.o $xofile 1>&2
 		exit 2
 	fi
 	# benchmarks are named BenchmarkFoo.
 	pattern='Benchmark([^a-z].*)?'
-	benchmarks=$($NM -p -v _gotest_.o $xofile | egrep " $text .*\."$pattern'$' | grep -v '\..*\..*\.' | fgrep -v '$' | fgrep -v ' __go_' | sed 's/.* //' | $symtogo)
+	benchmarks=$($NM -p -v _gotest_.o $xofile | egrep " $text .*\."$pattern'$' | grep -v '[^ ]\..*\.' | fgrep -v ' __go_' | sed 's/.* //' | $symtogo)
 
 	# examples are named ExampleFoo
 	pattern='Example([^a-z].*)?'
-	examples=$($NM -p -v _gotest_.o $xofile | egrep " $text .*\."$pattern'$' | grep -v '\..*\..*\.' | fgrep -v '$' | fgrep -v ' __go_' | sed 's/.* //' | $symtogo)
+	examples=$($NM -p -v _gotest_.o $xofile | egrep " $text .*\."$pattern'$' | grep -v '[^ ]\..*\.' | fgrep -v ' __go_' | sed 's/.* //' | $symtogo)
 
 	# package spec
 	echo 'package main'