[llvm][utils] Disable lldb formatters for PointerIntPair and PointerUnion

[kastiglione]

Summary

These synthetic providers use expression evaluation and fail in some cases.

Examples:

llvm::PointerIntPair<llvm::PointerUnion<const Type *, const ExtQuals *>, 
                     Qualifiers::FastWidth> Value;

and

typedef llvm::PointerUnion<const ValueDecl *, const Expr *, TypeInfoLValue,
                           DynamicAllocLValue>
        PtrTy;

Original contribution: D117779

rdar://110791233
rdar://112195543

llvm/utils/lldbDataFormatters.py

debugger.HandleCommand(
         "-F lldbDataFormatters.StringRefSummaryProvider "
         '-x "^llvm::StringRef$"'
     )
     debugger.HandleCommand(
         "type summary add -w llvm "
         "-F lldbDataFormatters.ConstStringSummaryProvider "
         '-x "^lldb_private::ConstString$"'
     )
-    debugger.HandleCommand(
-        "type synthetic add -w llvm "
-        "-l lldbDataFormatters.PointerIntPairSynthProvider "
-        '-x "^llvm::PointerIntPair<.+>$"'
-    )
-    debugger.HandleCommand(
-        "type synthetic add -w llvm "
-        "-l lldbDataFormatters.PointerUnionSynthProvider "
-        '-x "^llvm::PointerUnion<.+>$"'
-    )
+
+    # The synthetic providers for PointerIntPair and PointerUnion are disabled
+    # because of a few issues. One example is template arguments that are
+    # non-pointer types that instead specialize PointerLikeTypeTraits.
+    # debugger.HandleCommand(
+    #     "type synthetic add -w llvm "
+    #     "-l lldbDataFormatters.PointerIntPairSynthProvider "
+    #     '-x "^llvm::PointerIntPair<.+>$"'
+    # )
+    # debugger.HandleCommand(
+    #     "type synthetic add -w llvm "
+    #     "-l lldbDataFormatters.PointerUnionSynthProvider "
+    #     '-x "^llvm::PointerUnion<.+>$"'
+    # )
 
 
 # Pretty printer for llvm::SmallVector/llvm::SmallVectorImpl
 class SmallVectorSynthProvider:
     def __init__(self, valobj, internal_dict):
         self.valobj = valobj
         self.update()  # initialize this provider