Edge case: Ghost empty string in LLVM while Py seems to be correct

tests/integration/lit.cfg

@@ -15,6 +15,6 @@ config.substitutions.append(('%COMPARE_EXEC', "{}/tests/integration/tools/compar
 config.substitutions.append(('%FILECHECK_TESTER_EXEC', "{}/tests/integration/tools/FileCheck/FileCheck".format(current_dir)))
 
 if real_only:
-    config.suffixes = ['.itest', '.c']
+    config.suffixes = ['.itest', '.itest-llvm', '.c']
 else:
-    config.suffixes = ['.itest', '.c', '.py-itest']
+    config.suffixes = ['.itest', '.itest-py', '.c']

tests/integration/tests/check_commands/CHECK/failure/10-scanning-from-here-location/CHECK.itest → tests/integration/tests/check_commands/CHECK/failure/10-edge-case-llvm-vs-py-ghost-newline-in-llvm/CHECK.itest-llvm

@@ -3,8 +3,7 @@
 ; CHECK: {{.*}}CHECK.check:2:8: error: CHECK: expected string not found in input
 ; CHECK: CHECK: String2
 ; CHECK:        ^
-; TODO
-; CHECK <stdin>:1:8: note: scanning from here
-; CHECK String1
-; CHECK:        ^
+; CHECK: <stdin>:2:1: note: scanning from here
+; CHECK-EMPTY:
+; CHECK: ^
 ; CHECK-EMPTY:

tests/integration/tests/check_commands/CHECK/failure/10-edge-case-llvm-vs-py-ghost-newline-in-llvm/CHECK.itest-py

@@ -0,0 +1,12 @@
+; RUN: echo -e "String1" | (%FILECHECK_EXEC %S/CHECK.check 2>&1; test $? = 1;) | %FILECHECK_EXEC %s --strict-whitespace --match-full-lines
+; CHECK:{{^.*}}FileCheck{{(\.py)?$}}
+// TODO: Something wrong with the greediness here:
+; CHECK***:{{^.*}}CHECK.check:2:8: error: CHECK***: expected string not found in input
+; CHECK:{{^.*}}
+// TODO: And here:
+; CHECK:{{.*}}String2
+; CHECK:       ^
+; CHECK:<stdin>:1:8: note: scanning from here
+; CHECK:String1
+; CHECK:       ^
+; CHECK-EMPTY: