`update_{llc_test,test}_checks`: Correctly handle multi-lined RUN lines.

[bryant]

Summary

For instance,

; RUN: llvm-as < %s | llc -mtriple=i686-apple-darwin9 -mattr=sse41 \
; RUN:              | FileCheck %s -check-prefix=X32
; RUN: llvm-as < %s | llc -mtriple=x86_64-apple-darwin9 -mattr=sse41 \
; RUN:              | FileCheck %s -check-prefix=X64

(from http://llvm.org/docs/CommandGuide/FileCheck.html#the-filecheck-check-prefix-option ).

Adding Sanjay and Chandler since they appear in the blame list for both files.

[chandlerc]

Sure!

[bryant]

I don't have commit access. Please land if everything's good. Thanks.

llvm/trunk/utils/update_llc_test_checks.py

for test in args.tests:
 
     triple_in_ir = None
     for l in input_lines:
       m = TRIPLE_IR_RE.match(l)
       if m:
         triple_in_ir = m.groups()[0]
         break
 
-    run_lines = [m.group(1)
+    raw_lines = [m.group(1)
                  for m in [RUN_LINE_RE.match(l) for l in input_lines] if m]
+    run_lines = [raw_lines[0]] if len(raw_lines) > 0 else []
+    for l in raw_lines[1:]:
+        if run_lines[-1].endswith("\\"):
+            run_lines[-1] = run_lines[-1].rstrip("\\") + " " + l
+        else:
+            run_lines.append(l)
+
     if args.verbose:
       print >>sys.stderr, 'Found %d RUN lines:' % (len(run_lines),)
       for l in run_lines:
         print >>sys.stderr, '  RUN: ' + l
 
     run_list = []
     for l in run_lines:
       commands = [cmd.strip() for cmd in l.split('|', 1)]

llvm/trunk/utils/update_test_checks.py

if (tool_basename != "llc" and tool_basename != "opt"):
     sys.exit(1)
 
   for test in args.tests:
     if args.verbose:
       print >>sys.stderr, 'Scanning for RUN lines in test file: %s' % (test,)
     with open(test) as f:
       input_lines = [l.rstrip() for l in f]
 
-    run_lines = [m.group(1)
+    raw_lines = [m.group(1)
                  for m in [RUN_LINE_RE.match(l) for l in input_lines] if m]
+    run_lines = [raw_lines[0]] if len(raw_lines) > 0 else []
+    for l in raw_lines[1:]:
+        if run_lines[-1].endswith("\\"):
+            run_lines[-1] = run_lines[-1].rstrip("\\") + " " + l
+        else:
+            run_lines.append(l)
+
     if args.verbose:
       print >>sys.stderr, 'Found %d RUN lines:' % (len(run_lines),)
       for l in run_lines:
         print >>sys.stderr, '  RUN: ' + l
 
     prefix_list = []
     for l in run_lines:
       (tool_cmd, filecheck_cmd) = tuple([cmd.strip() for cmd in l.split('|', 1)])