Mostly avoid using ArrayHeader* in generated code. (#116)

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/DataLayout.kt

@@ -6,6 +6,8 @@ import org.jetbrains.kotlin.types.KotlinType
 
 internal fun ContextUtils.getLLVMType(type: KotlinType): LLVMTypeRef {
     return when {
+        // Nullable types must be represented as objects for boxing.
+        type.isMarkedNullable -> this.kObjHeaderPtr
         KotlinBuiltIns.isBoolean(type) -> LLVMInt1Type()
         KotlinBuiltIns.isByte(type) -> LLVMInt8Type()
         KotlinBuiltIns.isShort(type) || KotlinBuiltIns.isChar(type) -> LLVMInt16Type()
@@ -14,7 +16,6 @@ internal fun ContextUtils.getLLVMType(type: KotlinType): LLVMTypeRef {
         KotlinBuiltIns.isUnit(type) -> LLVMVoidType() // TODO: handle Unit parameter case
         KotlinBuiltIns.isFloat(type) -> LLVMFloatType()
         KotlinBuiltIns.isDouble(type) -> LLVMDoubleType()
-        KotlinBuiltIns.isArray(type) || KotlinBuiltIns.isPrimitiveArray(type)-> this.kArrayHeaderPtr
         !KotlinBuiltIns.isPrimitiveType(type) -> this.kObjHeaderPtr
         else -> throw NotImplementedError(type.toString() + " is not supported")
     }!!

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/LlvmUtils.kt

@@ -112,10 +112,6 @@ internal val ContextUtils.kObjHeaderPtr: LLVMTypeRef
     get() = pointerType(kObjHeader)
 internal val ContextUtils.kObjHeaderPtrPtr: LLVMTypeRef
     get() = pointerType(kObjHeaderPtr)
-internal val ContextUtils.kArrayHeader: LLVMTypeRef
-    get() = LLVMGetTypeByName(context.llvmModule, "struct.ArrayHeader")!!
-internal val ContextUtils.kArrayHeaderPtr: LLVMTypeRef
-    get() = pointerType(kArrayHeader)
 internal val ContextUtils.kTypeInfoPtr: LLVMTypeRef
     get() = pointerType(kTypeInfo)
 internal val kInt1         = LLVMInt1Type()!!
@@ -124,9 +120,6 @@ internal val kInt8PtrPtr   = pointerType(kInt8Ptr)
 internal val kImmInt32One  = Int32(1).llvm
 internal val ContextUtils.kNullObjHeaderPtr: LLVMValueRef
     get() = LLVMConstNull(this.kObjHeaderPtr)!!
-internal val ContextUtils.kNullArrayHeaderPtr: LLVMValueRef
-    get() = LLVMConstNull(this.kArrayHeaderPtr)!!
-
 
 internal fun pointerType(pointeeType: LLVMTypeRef) = LLVMPointerType(pointeeType, 0)!!