[DirectX] Drop dx.Layout extension type

TODO: This must go in after the frontend changes

Author: bogner

llvm/include/llvm/Analysis/DXILResource.h

@@ -222,27 +222,6 @@ class AnyResourceExtType : public TargetExtType {
   }
 };
 
-/// The dx.Layout target extension type
-///
-/// `target("dx.Layout", <Type>, <size>, [offsets...])`
-class LayoutExtType : public TargetExtType {
-public:
-  LayoutExtType() = delete;
-  LayoutExtType(const LayoutExtType &) = delete;
-  LayoutExtType &operator=(const LayoutExtType &) = delete;
-
-  Type *getWrappedType() const { return getTypeParameter(0); }
-  uint32_t getSize() const { return getIntParameter(0); }
-  uint32_t getOffsetOfElement(int I) const { return getIntParameter(I + 1); }
-
-  static bool classof(const TargetExtType *T) {
-    return T->getName() == "dx.Layout";
-  }
-  static bool classof(const Type *T) {
-    return isa<TargetExtType>(T) && classof(cast<TargetExtType>(T));
-  }
-};
-
 /// The dx.Padding target extension type
 ///
 /// `target("dx.Padding", NumBytes)`

llvm/lib/Analysis/DXILResource.cpp

@@ -380,13 +380,6 @@ StructType *ResourceTypeInfo::createElementStruct(StringRef CBufferName) {
       Name.append(CBufferName);
     }
 
-    // TODO: Remove this when we update the frontend to use explicit padding.
-    if (LayoutExtType *LayoutType =
-            dyn_cast<LayoutExtType>(RTy->getResourceType())) {
-      StructType *Ty = cast<StructType>(LayoutType->getWrappedType());
-      return StructType::create(Ty->elements(), Name);
-    }
-
     return getOrCreateElementStruct(
         getTypeWithoutPadding(RTy->getResourceType()), Name);
   }
@@ -498,13 +491,7 @@ ResourceTypeInfo::UAVInfo ResourceTypeInfo::getUAV() const {
 
 uint32_t ResourceTypeInfo::getCBufferSize(const DataLayout &DL) const {
   assert(isCBuffer() && "Not a CBuffer");
-
   Type *ElTy = cast<CBufferExtType>(HandleTy)->getResourceType();
-
-  // TODO: Remove this when we update the frontend to use explicit padding.
-  if (auto *LayoutTy = dyn_cast<LayoutExtType>(ElTy))
-    return LayoutTy->getSize();
-
   return DL.getTypeAllocSize(ElTy);
 }