[IR] Replaced K/N findPackage with common getPackageFragment

compiler/ir/backend.jvm/codegen/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt

@@ -582,7 +582,7 @@ class ExpressionCodegen(
             // Copy-pasted bytecode blocks are not suspension points.
             symbol.owner.isInline ->
                 if (symbol.owner.name.asString() == "suspendCoroutineUninterceptedOrReturn" &&
-                    symbol.owner.getPackageFragment()?.fqName == FqName("kotlin.coroutines.intrinsics")
+                    symbol.owner.getPackageFragment().fqName == FqName("kotlin.coroutines.intrinsics")
                 )
                     SuspensionPointKind.ALWAYS
                 else

compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/AssertionLowering.kt

@@ -119,5 +119,5 @@ private class AssertionLowering(private val context: JvmBackendContext) :
     }
 
     private val IrFunction.isAssert: Boolean
-        get() = name.asString() == "assert" && getPackageFragment()?.fqName == StandardNames.BUILT_INS_PACKAGE_FQ_NAME
+        get() = name.asString() == "assert" && getPackageFragment().fqName == StandardNames.BUILT_INS_PACKAGE_FQ_NAME
 }

compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/PropertyReferenceDelegationLowering.kt

@@ -85,7 +85,7 @@ private class PropertyReferenceDelegationTransformer(val context: JvmBackendCont
         }
 
     private val IrStatement.isStdlibCall: Boolean
-        get() = this is IrCall && symbol.owner.getPackageFragment()?.fqName == StandardNames.BUILT_INS_PACKAGE_FQ_NAME
+        get() = this is IrCall && symbol.owner.getPackageFragment().fqName == StandardNames.BUILT_INS_PACKAGE_FQ_NAME
 
     // Some receivers don't need to be stored in fields and can be reevaluated every time an accessor is called:
     private fun IrExpression.canInline(visibleScopes: Set<IrDeclarationParent>): Boolean = when (this) {

compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/SyntheticAccessorLowering.kt

@@ -89,7 +89,7 @@ internal class SyntheticAccessorLowering(val context: JvmBackendContext) : FileL
 
             val ownerClass = declaration.parent as? IrClass ?: return true // locals are always accessible
             val scopeClassOrPackage = inlineScopeResolver.findContainer(currentScope!!.irElement) ?: return false
-            val samePackage = ownerClass.getPackageFragment()?.fqName == scopeClassOrPackage.getPackageFragment()?.fqName
+            val samePackage = ownerClass.getPackageFragment().fqName == scopeClassOrPackage.getPackageFragment()?.fqName
             return when {
                 jvmVisibility == 0 /* package only */ -> samePackage
                 jvmVisibility == Opcodes.ACC_PRIVATE -> ownerClass == scopeClassOrPackage

compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/VarargLowering.kt

@@ -101,7 +101,7 @@ internal const val ARRAY_OF_NAME = "arrayOf"
 
 internal fun IrFunction.isArrayOf(): Boolean {
     val parent = when (val directParent = parent) {
-        is IrClass -> directParent.getPackageFragment() ?: return false
+        is IrClass -> directParent.getPackageFragment()
         is IrPackageFragment -> directParent
         else -> return false
     }

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/ir/IrInlineReferenceLocator.kt

@@ -65,8 +65,8 @@ class IrInlineScopeResolver(context: JvmBackendContext) : IrInlineReferenceLocat
         get() = isInline && DescriptorVisibilities.isPrivate(visibility)
 
     private fun IrFunction.isCoroutineIntrinsic(): Boolean =
-        (name.asString() == "suspendCoroutine" && getPackageFragment()?.fqName == FqName("kotlin.coroutines")) ||
-                (name.asString() == "suspendCoroutineUninterceptedOrReturn" && getPackageFragment()?.fqName == FqName("kotlin.coroutines.intrinsics"))
+        (name.asString() == "suspendCoroutine" && getPackageFragment().fqName == FqName("kotlin.coroutines")) ||
+                (name.asString() == "suspendCoroutineUninterceptedOrReturn" && getPackageFragment().fqName == FqName("kotlin.coroutines.intrinsics"))
 
     fun findContainer(scope: IrElement): IrDeclarationContainer? =
         findContainer(scope, approximateToPackage = false)

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/mapping/MethodSignatureMapper.kt

@@ -452,7 +452,7 @@ class MethodSignatureMapper(private val context: JvmBackendContext) {
     }
 
     private val IrSimpleFunction.isBuiltIn: Boolean
-        get() = getPackageFragment()?.fqName == StandardNames.BUILT_INS_PACKAGE_FQ_NAME ||
+        get() = getPackageFragment().fqName == StandardNames.BUILT_INS_PACKAGE_FQ_NAME ||
                 parent.safeAs<IrClass>()?.fqNameWhenAvailable?.toUnsafe()?.let(JavaToKotlinClassMap::mapKotlinToJava) != null
 
     // From BuiltinMethodsWithDifferentJvmName.isBuiltinFunctionWithDifferentNameInJvm, BuiltinMethodsWithDifferentJvmName.getJvmName

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/metadata/DescriptorMetadataSerializer.kt

@@ -63,7 +63,7 @@ class DescriptorMetadataSerializer(
             is DescriptorMetadataSource.Class -> serializer!!.classProto(metadata.descriptor).build()
             is DescriptorMetadataSource.Script -> serializer!!.classProto(metadata.descriptor).build()
             is DescriptorMetadataSource.File ->
-                serializer!!.packagePartProto(irClass.getPackageFragment()!!.fqName, metadata.descriptors).apply {
+                serializer!!.packagePartProto(irClass.getPackageFragment().fqName, metadata.descriptors).apply {
                     serializerExtension.serializeJvmPackage(this, type)
                 }.build()
             is DescriptorMetadataSource.Function -> {