regexp: trivial change in comments to update code.google.com link

Replaced code.google.com/p/re2/ with github.com/google/re2/ and
updated the file names (re2-exhaustive.txt.bz2 not re2.txt.gz)
as well as the re2 make command (make log).

Change-Id: I15937b0b8a898d78d45366857ed86421c8d69960
Reviewed-on: https://go-review.googlesource.com/9372Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/regexp/exec_test.go

@@ -24,8 +24,8 @@ import (
 // complexity, over all possible strings over a given alphabet,
 // up to a given size.  Rather than try to link with RE2, we read a
 // log file containing the test cases and the expected matches.
-// The log file, re2.txt, is generated by running 'make exhaustive-log'
-// in the open source RE2 distribution.  http://code.google.com/p/re2/
+// The log file, re2-exhaustive.txt, is generated by running 'make log'
+// in the open source RE2 distribution https://github.com/google/re2/.
 //
 // The test file format is a sequence of stanzas like:
 //
@@ -59,8 +59,8 @@ import (
 // a capital letter are test names printed during RE2's test suite
 // and are echoed into t but otherwise ignored.
 //
-// At time of writing, re2.txt is 32 MB but compresses to 760 kB,
-// so we store re2.txt.gz in the repository and decompress it on the fly.
+// At time of writing, re2-exhaustive.txt is 59 MB but compresses to 385 kB,
+// so we store re2-exhaustive.txt.bz2 in the repository and decompress it on the fly.
 //
 func TestRE2Search(t *testing.T) {
 	testRE2(t, "testdata/re2-search.txt")

src/regexp/testdata/README

@@ -19,5 +19,6 @@ Such changes are marked with 'RE2/Go'.
 RE2 Test Files
 
 re2-exhaustive.txt.bz2 and re2-search.txt are built by running
-'make log' in the RE2 distribution.  http://code.google.com/p/re2/.
+'make log' in the RE2 distribution https://github.com/google/re2/
+
 The exhaustive file is compressed because it is huge.