update_mir_test_checks: Handle empty liveins

An empty livein block doesn't make much sense (why not just omit it?)
but they're legal and some tests have them, so its best to handle it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316089 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/update_mir_test_checks.py b/utils/update_mir_test_checks.py
index 7b9197474f6bee5024276364d9009d3d17a713e0..e2ae3e7b51e481ed760223bec5bf51542f846f29 100755 (executable)
--- a/utils/update_mir_test_checks.py
+++ b/utils/update_mir_test_checks.py
@@ -40,7 +40,7 @@ VREG_RE = re.compile(r'(%[0-9]+)(?::[a-z0-9_]+)?(?:\([<>a-z0-9 ]+\))?')
 VREG_DEF_RE = re.compile(
     r'^ *(?P<vregs>{0}(?:, {0})*) '
     r'= (?P<opcode>[A-Zt][A-Za-z0-9_]+)'.format(VREG_RE.pattern))
-PREFIX_DATA_RE = re.compile(r'^ *(;|bb.[0-9].*: *$|[a-z]+: |$)')
+PREFIX_DATA_RE = re.compile(r'^ *(;|bb.[0-9].*: *$|[a-z]+:( |$)|$)')
 
 MIR_FUNC_RE = re.compile(
     r'^---$'