[llvm] [cross-project] Add tests for LLDB data-formatters for llvm::ArrayRef (PR #173238)

[Mikael Holmen via llvm-commits]

================
@@ -0,0 +1,25 @@
+# RUN: split-file %s %t
+# RUN: lldb -b -x -o 'command script import %llvm_src_root/utils/lldbDataFormatters.py' -s %t/commands.input %llvm_tools_dir/check-lldb-llvm-support-arrayref | FileCheck %t/checks
+
+#--- commands.input
+b main
+run
+p ArrayRef
+p MutableArrayRef
+
+#--- checks
+# CHECK:      (lldb) p ArrayRef
+# CHECK-NEXT: (llvm::ArrayRef<int>) size=3 {
----------------
mikaelholmen wrote:

Hi @Michael137 

I randomly see this testcase failing on a downstream build bot. I've seen failures like this:
```
/repo/llvm/build-all-builtins/projects/cross-project-tests/debuginfo-tests/llvm-prettyprinters/lldb/Output/arrayref.test.tmp/checks:2:15: error: CHECK-NEXT: is not on the line after the previous match
# CHECK-NEXT: (llvm::ArrayRef<int>) size=3 {
              ^
<stdin>:20:1: note: 'next' match was here
(llvm::ArrayRef<int>) size=3 {
^
<stdin>:18:18: note: previous match ended here
(lldb) p ArrayRef
                 ^
<stdin>:19:1: note: non-matching line after previous match is here
1 location added to breakpoint 1
^

Input file: <stdin>
Check file: /repo/llvm/build-all-builtins/projects/cross-project-tests/debuginfo-tests/llvm-prettyprinters/lldb/Output/arrayref.test.tmp/checks

-dump-input=help explains the following input dump.

Input was:
<<<<<<
        .
        .
        .
       15:  7  
       16: -> 8 int main() { return 0; } 
       17:  ^ 
       18: (lldb) p ArrayRef 
       19: 1 location added to breakpoint 1 
       20: (llvm::ArrayRef<int>) size=3 { 
next:2     !~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  error: match on wrong line
       21:  [0] = 1 
       22:  [1] = 2 
       23:  [2] = 3 
       24: } 
       25: (lldb) p MutableArrayRef 
        .
        .
        .
>>>>>>

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 

1 warning(s) in tests
********************
Failed Tests (1):
  cross-project-tests :: debuginfo-tests/llvm-prettyprinters/lldb/arrayref.test
```
so there something unexpected between the expected lines in the output.
It happens now and then. Any idea what the problem is and if it can be fixed?

https://github.com/llvm/llvm-project/pull/173238