Minor: More tests for warnings suppression

compiler/testData/diagnostics/tests/suppress/allWarnings/suppressWarningsOnAnonymousObjectInVariable.kt

@@ -0,0 +1,4 @@
+@Suppress("warnings")
+val anonymous = object {
+    fun foo(p: String?? = "" as String) {}
+}

compiler/testData/diagnostics/tests/suppress/allWarnings/suppressWarningsOnAnonymousObjectInVariable.txt

@@ -0,0 +1,3 @@
+package
+
+@kotlin.Suppress(names = {"warnings"}) public val anonymous: kotlin.Any

compiler/testData/diagnostics/tests/suppress/allWarnings/suppressWarningsOnFile.kt

@@ -0,0 +1,7 @@
+@file:Suppress("warnings")
+
+class C {
+    companion object {
+        val foo: String?? = null as Nothing?
+    }
+}

compiler/testData/diagnostics/tests/suppress/allWarnings/suppressWarningsOnFile.txt

@@ -0,0 +1,16 @@
+package
+
+public final class C {
+    public constructor C()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    public companion object Companion {
+        private constructor Companion()
+        public final val foo: kotlin.String? = null
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}