[FIR] Prohibit suspend anonymous functions in statement position

^KT-62018 Fixed
^KT-62019

compiler/testData/diagnostics/tests/modifiers/suspendAnonymousFunction.fir.kt

@@ -0,0 +1,7 @@
+// ISSUE: KT-57991
+
+fun foo() {
+    <!ANONYMOUS_SUSPEND_FUNCTION!>suspend<!> fun() {
+
+    }
+}

compiler/testData/diagnostics/tests/modifiers/suspendAnonymousFunction.kt

@@ -1,4 +1,3 @@
-// FIR_IDENTICAL
 // ISSUE: KT-57991
 
 fun foo() {

compiler/testData/diagnostics/tests/suspendConversion/suspendAnonymousAsNonSuspend.fir.kt

@@ -4,6 +4,6 @@ fun <T> produce(arg: () -> T): T = arg()
 
 fun main() {
     produce {
-        <!ARGUMENT_TYPE_MISMATCH!>suspend fun() {}<!> // CCE
+        <!ARGUMENT_TYPE_MISMATCH!><!ANONYMOUS_SUSPEND_FUNCTION!>suspend<!> fun() {}<!> // CCE
     }
 }

compiler/testData/diagnostics/tests/suspendConversion/suspendCallFromAnonymousSuspend.fir.kt

@@ -0,0 +1,11 @@
+// FIR_DUMP
+
+fun foo() {
+    <!ANONYMOUS_SUSPEND_FUNCTION!>suspend<!> fun() {
+        bar()
+    }
+}
+
+suspend fun bar() {
+
+}

compiler/testData/diagnostics/tests/suspendConversion/suspendCallFromAnonymousSuspend.fir.txt

@@ -1,4 +1,4 @@
-FILE: suspendCallFromAnonymousSuspend.kt
+FILE: suspendCallFromAnonymousSuspend.fir.kt
     public final fun foo(): R|kotlin/Unit| {
         suspend fun <anonymous>(): R|kotlin/Unit| <inline=Unknown>  {
             R|/bar|()

compiler/testData/diagnostics/tests/suspendConversion/suspendCallFromAnonymousSuspend.kt

@@ -1,4 +1,3 @@
-// FIR_IDENTICAL
 // FIR_DUMP
 
 fun foo() {