Revert "Handle missing enumeration value in iwyu.cc"

This reverts commit a92ed0d6f8acee6989c807c4ab6809a5f324a3df.

This breaking change happened in Clang after the 12 branch was taken,
and so is not compatible with libclang-12-dev.

1 files changed, 0 insertions, 1 deletions

diff --git a/iwyu.cc b/iwyu.cc
index f9fbea5..355e793 100644
--- a/iwyu.cc
+++ b/iwyu.cc
@@ -1999,7 +1999,6 @@ class IwyuBaseAstVisitor : public BaseAstVisitor<Derived> {
       case clang::CK_IntegralToFixedPoint:
       case clang::CK_IntegralToFloating:
       case clang::CK_IntegralToPointer:
-      case clang::CK_MatrixCast:
       case clang::CK_MemberPointerToBoolean:
       case clang::CK_NullToMemberPointer:
       case clang::CK_NullToPointer: