[update_cc_test_checks.py] Use CHECK_RE from common

Summary:
This change modifies the common.CHECK_RE regex to also handle '//'
comment prefixes which allows us to share it between clang and IR tests.
Using the regex from common means that *-SAME lines are also stripped
now. Before this change using the --function-signature flag would result
in -SAME: lines from previous runs not being removed.

Reviewers: MaskRay, jdoerfert

Reviewed By: jdoerfert

Subscribers: jdoerfert, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70890

llvm/utils/UpdateTestChecks/common.py

@@ -61,7 +61,7 @@ def invoke_tool(exe, cmd_args, ir):
 RUN_LINE_RE = re.compile(r'^\s*(?://|[;#])\s*RUN:\s*(.*)$')
 CHECK_PREFIX_RE = re.compile(r'--?check-prefix(?:es)?[= ](\S+)')
 PREFIX_RE = re.compile('^[a-zA-Z0-9_-]+$')
-CHECK_RE = re.compile(r'^\s*[;#]\s*([^:]+?)(?:-NEXT|-NOT|-DAG|-LABEL|-SAME)?:')
+CHECK_RE = re.compile(r'^\s*(?://|[;#])\s*([^:]+?)(?:-NEXT|-NOT|-DAG|-LABEL|-SAME)?:')
 
 OPT_FUNCTION_RE = re.compile(
     r'^\s*define\s+(?:internal\s+)?[^@]*@(?P<func>[\w-]+?)\s*'

llvm/utils/update_cc_test_checks.py

@@ -28,8 +28,6 @@ from UpdateTestChecks import asm, common
 
 ADVERT = '// NOTE: Assertions have been autogenerated by '
 
-CHECK_RE = re.compile(r'^\s*//\s*([^:]+?)(?:-NEXT|-NOT|-DAG|-LABEL)?:')
-
 SUBST = {
     '%clang': [],
     '%clang_cc1': ['-cc1'],
@@ -238,7 +236,7 @@ def main():
     input_lines = []
     with open(filename, 'r+') as f:
       for line in f:
-        m = CHECK_RE.match(line)
+        m = common.CHECK_RE.match(line)
         if not (m and m.group(1) in prefix_set) and line != '//\n':
           input_lines.append(line)
       f.seek(0)