[psi] decompiled code doesn't have function bodies

otherwise AST for decompiled code would be loaded by findChildByClass call

^ KTIJ-25047

compiler/psi/src/org/jetbrains/kotlin/psi/KtNamedFunction.java

@@ -23,10 +23,8 @@ import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiModifiableCodeBlock;
 import com.intellij.psi.tree.IElementType;
 import com.intellij.psi.util.PsiTreeUtil;
-import com.intellij.util.AstLoadingFilter;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
-import org.jetbrains.kotlin.KtNodeTypes;
 import org.jetbrains.kotlin.lexer.KtTokens;
 import org.jetbrains.kotlin.psi.psiUtil.KtPsiUtilKt;
 import org.jetbrains.kotlin.psi.stubs.KotlinFunctionStub;
@@ -142,8 +140,14 @@ public class KtNamedFunction extends KtTypeParameterListOwnerStub<KotlinFunction
     @Override
     public KtBlockExpression getBodyBlockExpression() {
         KotlinFunctionStub stub = getStub();
-        if (stub != null && !(stub.hasBlockBody() && stub.hasBody())) {
+        if (stub != null) {
-            return null;
+            if (!(stub.hasBlockBody() && stub.hasBody())) {
+                return null;
+            }
+            if (getContainingKtFile().isCompiled()) {
+                //don't load ast
+                return null;
+            }
         }
 
         KtExpression bodyExpression = findChildByClass(KtExpression.class);

compiler/psi/src/org/jetbrains/kotlin/psi/KtPropertyAccessor.java

@@ -106,8 +106,13 @@ public class KtPropertyAccessor extends KtDeclarationStub<KotlinPropertyAccessor
     @Override
     public KtBlockExpression getBodyBlockExpression() {
         KotlinPropertyAccessorStub stub = getStub();
-        if (stub != null && !(stub.hasBlockBody() && stub.hasBody())) {
+        if (stub != null) {
-            return null;
+            if (!(stub.hasBlockBody() && stub.hasBody())) {
+                return null;
+            }
+            if (getContainingKtFile().isCompiled()) {
+                return null;
+            }
         }
 
         KtExpression bodyExpression = findChildByClass(KtExpression.class);

compiler/psi/src/org/jetbrains/kotlin/psi/KtSecondaryConstructor.kt

@@ -30,8 +30,14 @@ class KtSecondaryConstructor : KtConstructor<KtSecondaryConstructor> {
     override fun getContainingClassOrObject() = parent.parent as KtClassOrObject
 
     override fun getBodyExpression(): KtBlockExpression? {
-        if (stub?.hasBody() == false) {
+        val stub = stub
-            return null
+        if (stub != null) {
+            if (stub.hasBody() == false) {
+                return null
+            }
+            if (containingKtFile.isCompiled) {
+                return null
+            }
         }
         return findChildByClass(KtBlockExpression::class.java)
     }