Initially strip only newlines from matched lines

Previously all whitespace was stripped, which caused regex patterns that
explicitly checked for whitespace at the end of the line to incorrectly fail.

Author: tlively

filecheck/filecheck.py

@@ -597,7 +597,7 @@ def exit_handler(code):
         failed_implicit_check = None
 
         while True:
-            line = line.rstrip()
+            line = line.rstrip("\n\r")
 
             unstripped_line = line
 

tests/integration/tests/check_commands/CHECK/one_string/positive-match/07-positive-regex-match-trailing-space/filecheck.check

@@ -0,0 +1 @@
+CHECK: {{^}}hello {{$}}

tests/integration/tests/check_commands/CHECK/one_string/positive-match/07-positive-regex-match-trailing-space/filecheck.input

@@ -0,0 +1 @@
+hello 

tests/integration/tests/check_commands/CHECK/one_string/positive-match/07-positive-regex-match-trailing-space/sample.itest

@@ -0,0 +1 @@
+RUN: %cat "%S/filecheck.input" | %expect_exit 0 --expect-no-content %FILECHECK_EXEC "%S/filecheck.check"