[FE] Make DiagnosticFactory.name not null

compiler/frontend/src/org/jetbrains/kotlin/checkers/diagnostics/factories/DebugInfoDiagnosticFactory0.kt

@@ -34,9 +34,8 @@ class DebugInfoDiagnosticFactory0 private constructor(
         return DebugInfoDiagnostic(expression, this)
     }
 
-    override var name: String?
+    override val name: String
         get() = "DEBUG_INFO_$privateName"
-        set(_) {}
 
     companion object {
         val SMARTCAST = DebugInfoDiagnosticFactory0("SMARTCAST", Severity.INFO)
@@ -51,4 +50,4 @@ class DebugInfoDiagnosticFactory0 private constructor(
         val MISSING_UNRESOLVED = DebugInfoDiagnosticFactory0("MISSING_UNRESOLVED")
         val DYNAMIC = DebugInfoDiagnosticFactory0("DYNAMIC", Severity.INFO)
     }
-}
+}

compiler/frontend/src/org/jetbrains/kotlin/checkers/diagnostics/factories/DebugInfoDiagnosticFactory1.kt

@@ -21,9 +21,8 @@ class DebugInfoDiagnosticFactory1 : DiagnosticFactory1<PsiElement, String>,
     DebugInfoDiagnosticFactory {
     private val privateName: String
 
-    override var name: String?
+    override val name: String
         get() = "DEBUG_INFO_$privateName"
-        set(_) {}
 
     override val withExplicitDefinitionOnly: Boolean
 
@@ -85,4 +84,4 @@ class DebugInfoDiagnosticFactory1 : DiagnosticFactory1<PsiElement, String>,
             return DebugInfoDiagnosticFactory1(name, severity, withExplicitDefinitionOnly)
         }
     }
-}
+}

compiler/frontend/src/org/jetbrains/kotlin/checkers/diagnostics/factories/SyntaxErrorDiagnosticFactory.kt

@@ -10,9 +10,8 @@ import org.jetbrains.kotlin.diagnostics.DiagnosticFactory
 import org.jetbrains.kotlin.diagnostics.Severity
 
 class SyntaxErrorDiagnosticFactory private constructor() : DiagnosticFactory<SyntaxErrorDiagnostic>(Severity.ERROR) {
-    override var name: String?
+    override val name: String
         get() = "SYNTAX"
-        set(_) {}
 
     companion object {
         val INSTANCE = SyntaxErrorDiagnosticFactory()

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java

@@ -1199,7 +1199,7 @@ public interface Errors {
                         Object value = field.get(null);
                         if (value instanceof DiagnosticFactory) {
                             DiagnosticFactory<?> factory = (DiagnosticFactory<?>)value;
-                            factory.setName(field.getName());
+                            factory.initializeName(field.getName());
 
                             factory.setDefaultRenderer((DiagnosticRenderer) diagnosticToRendererMap.get(factory));
                         }