[FIR] Add inline checker for bodies of inline functions

This checker doesn't support `@PublishedAPI` yet, so some BB tests for it
 were muted. #KT-46270

compiler/tests-spec/testData/diagnostics/linked/overload-resolution/building-the-overload-candidate-set-ocs/operator-call/p-1/neg/2.2.fir.kt

@@ -20,8 +20,8 @@ inline operator fun B?.plusAssign( c: ()->Any) { } //(1)
 @JvmName("aa")
 inline  operator fun B?.plusAssign( c: ()->C) { //(2)
 
-    this += {1}
-    <!DEBUG_INFO_CALL("fqName: testPackCase1.plusAssign; typeCall: inline operator extension function")!>this += {1}<!>
+    this <!RECURSION_IN_INLINE!>+=<!> {1}
+    <!DEBUG_INFO_CALL("fqName: testPackCase1.plusAssign; typeCall: inline operator extension function")!>this <!RECURSION_IN_INLINE!>+=<!> {1}<!>
 }
 
 class C