[IR] Add a target extension type to LLVM.

Target-extension types represent types that need to be preserved through
optimization, but otherwise are not introspectable by target-independent
optimizations. This patch doesn't add any uses of these types by an existing
backend, it only provides basic infrastructure such that these types would work
correctly.

Reviewed By: nikic, barannikov88

Differential Revision: https://reviews.llvm.org/D135202

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/IR/DataLayout.cpp b/llvm/lib/IR/DataLayout.cpp
index 4bd0887..fb331ee 100644
--- a/llvm/lib/IR/DataLayout.cpp
+++ b/llvm/lib/IR/DataLayout.cpp
@@ -816,6 +816,10 @@ Align DataLayout::getAlignment(Type *Ty, bool abi_or_pref) const {
   }
   case Type::X86_AMXTyID:
     return Align(64);
+  case Type::TargetExtTyID: {
+    Type *LayoutTy = cast<TargetExtType>(Ty)->getLayoutType();
+    return getAlignment(LayoutTy, abi_or_pref);
+  }
   default:
     llvm_unreachable("Bad type for getAlignment!!!");
   }