K1: add more tests for BI assignment checker, fix corner cases

Related to KT-54004

compiler/testData/diagnostics/testsWithStdLib/builderInference/unsafeAssignment.kt

@@ -9,8 +9,13 @@ fun main(arg: Any) {
     val x = 57
     val value = myBuilder {
         doSmthng("one ")
-        a = <!TYPE_MISMATCH!>57<!>
+        run { a; this }.a = <!TYPE_MISMATCH, TYPE_MISMATCH!>10<!>
+        <!BUILDER_INFERENCE_STUB_RECEIVER, STUB_TYPE_IN_RECEIVER_CAUSES_AMBIGUITY, TYPE_MISMATCH, TYPE_MISMATCH!>a<!> <!OVERLOAD_RESOLUTION_AMBIGUITY_BECAUSE_OF_STUB_TYPES!>+=<!> 1
+        this.a = <!TYPE_MISMATCH!>57<!>
+        this.<!ILLEGAL_SELECTOR, VARIABLE_EXPECTED!>(a)<!> = <!TYPE_MISMATCH!>57<!>
         a = <!TYPE_MISMATCH!>x<!>
+        (a) = <!TYPE_MISMATCH!>x<!>
+        <!TYPE_MISMATCH!>a<!>.<!FUNCTION_CALL_EXPECTED, VARIABLE_EXPECTED!>hashCode<!> = <!TYPE_MISMATCH, TYPE_MISMATCH!>99<!>
         if (arg is String) {
             a = arg
         }