[llvm][utils] Make lldb data formatters show both summaries and children

[kastiglione]

Summary

When a type has a summary and synthetic child provider, the children are shown
only if --expand/-e is given.

This updates lldbDataFormatters.py to expand children of types that have both
a summary and synthetic children.

[mib]

LGTM!

llvm/utils/lldbDataFormatters.py

 """
 LLDB Formatters for LLVM data types.
 
 Load into LLDB with 'command script import /path/to/lldbDataFormatters.py'
 """
 
 import lldb
 import json
 
 def __lldb_init_module(debugger, internal_dict):
     debugger.HandleCommand('type category define -e llvm -l c++')
     debugger.HandleCommand('type synthetic add -w llvm '
                            '-l lldbDataFormatters.SmallVectorSynthProvider '
                            '-x "^llvm::SmallVectorImpl<.+>$"')
     debugger.HandleCommand('type summary add -w llvm '
-                           '-s "size=${svar%#}" '
+                           '-e -s "size=${svar%#}" '
                            '-x "^llvm::SmallVectorImpl<.+>$"')
     debugger.HandleCommand('type synthetic add -w llvm '
                            '-l lldbDataFormatters.SmallVectorSynthProvider '
                            '-x "^llvm::SmallVector<.+,.+>$"')
     debugger.HandleCommand('type summary add -w llvm '
-                           '-s "size=${svar%#}" '
+                           '-e -s "size=${svar%#}" '
                            '-x "^llvm::SmallVector<.+,.+>$"')
     debugger.HandleCommand('type synthetic add -w llvm '
                            '-l lldbDataFormatters.ArrayRefSynthProvider '
                            '-x "^llvm::ArrayRef<.+>$"')
     debugger.HandleCommand('type summary add -w llvm '
-                           '-s "size=${svar%#}" '
+                           '-e -s "size=${svar%#}" '
                            '-x "^llvm::ArrayRef<.+>$"')
     debugger.HandleCommand('type synthetic add -w llvm '
                            '-l lldbDataFormatters.OptionalSynthProvider '
                            '-x "^llvm::Optional<.+>$"')
     debugger.HandleCommand('type summary add -w llvm '
-                           '-F lldbDataFormatters.OptionalSummaryProvider '
+                           '-e -F lldbDataFormatters.OptionalSummaryProvider '
                            '-x "^llvm::Optional<.+>$"')
     debugger.HandleCommand('type summary add -w llvm '
                            '-F lldbDataFormatters.SmallStringSummaryProvider '
                            '-x "^llvm::SmallString<.+>$"')
     debugger.HandleCommand('type summary add -w llvm '
                            '-F lldbDataFormatters.StringRefSummaryProvider '
                            '-x "^llvm::StringRef$"')
     debugger.HandleCommand('type summary add -w llvm '