Revert "Implement _ExtInt as an extended int type specifier."

This reverts commit 61ba1481e200b5b35baa81ffcff81acb678e8508.

I'm reverting this because it breaks the lldb build with
incomplete switch coverage warnings. I would fix it forward,
but am not familiar enough with lldb to determine the correct
fix.

lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp:3958:11: error: enumeration values 'DependentExtInt' and 'ExtInt' not handled in switch [-Werror,-Wswitch]
  switch (qual_type->getTypeClass()) {
          ^
lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp:4633:11: error: enumeration values 'DependentExtInt' and 'ExtInt' not handled in switch [-Werror,-Wswitch]
  switch (qual_type->getTypeClass()) {
          ^
lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp:4889:11: error: enumeration values 'DependentExtInt' and 'ExtInt' not handled in switch [-Werror,-Wswitch]
  switch (qual_type->getTypeClass()) {

1 files changed, 0 insertions, 9 deletions

diff --git a/clang/lib/CodeGen/CodeGenTBAA.cpp b/clang/lib/CodeGen/CodeGenTBAA.cpp
index f4ebe68..8cc8c16 100644
--- a/clang/lib/CodeGen/CodeGenTBAA.cpp
+++ b/clang/lib/CodeGen/CodeGenTBAA.cpp
@@ -209,15 +209,6 @@ llvm::MDNode *CodeGenTBAA::getTypeInfoHelper(const Type *Ty) {
     return createScalarTypeNode(OutName, getChar(), Size);
   }
 
-  if (const auto *EIT = dyn_cast<ExtIntType>(Ty)) {
-    SmallString<256> OutName;
-    llvm::raw_svector_ostream Out(OutName);
-    // Don't specify signed/unsigned since integer types can alias despite sign
-    // differences.
-    Out << "_ExtInt(" << EIT->getNumBits() << ')';
-    return createScalarTypeNode(OutName, getChar(), Size);
-  }
-
   // For now, handle any other kind of type conservatively.
   return getChar();
 }