FIR2IR insert implicit cast on elvis RHS

compiler/testData/codegen/box/notNullAssertions/rightElvisOperand.kt

@@ -1,6 +1,4 @@
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND_FIR: JVM_IR
-// FIR status: Fail: should have been an exception in 'bar()'
 // MODULE: lib
 // FILE: RightElvisOperand.java
 

compiler/testData/ir/irText/types/nullChecks/nullCheckInElvisRhs.fir.ir.txt

@@ -0,0 +1,23 @@
+Module: lib
+Module: main
+FILE fqName:<root> fileName:/nullCheckInElvisRhs.kt
+  FUN name:baz visibility:public modality:FINAL <> () returnType:kotlin.String?
+    BLOCK_BODY
+      RETURN type=kotlin.Nothing from='public final fun baz (): kotlin.String? declared in <root>'
+        CONST Null type=kotlin.Nothing? value=null
+  FUN name:test visibility:public modality:FINAL <> () returnType:kotlin.String
+    BLOCK_BODY
+      RETURN type=kotlin.Nothing from='public final fun test (): kotlin.String declared in <root>'
+        BLOCK type=kotlin.String origin=ELVIS
+          VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:kotlin.String? [val]
+            CALL 'public final fun baz (): kotlin.String? declared in <root>' type=kotlin.String? origin=null
+          WHEN type=kotlin.String origin=ELVIS
+            BRANCH
+              if: CALL 'public final fun EQEQ (arg0: kotlin.Any?, arg1: kotlin.Any?): kotlin.Boolean declared in kotlin.internal.ir' type=kotlin.Boolean origin=EQEQ
+                arg0: GET_VAR 'val tmp_0: kotlin.String? [val] declared in <root>.test' type=kotlin.String? origin=null
+                arg1: CONST Null type=kotlin.Nothing? value=null
+              then: TYPE_OP type=kotlin.String origin=IMPLICIT_NOTNULL typeOperand=kotlin.String
+                CALL 'public/*package*/ open fun foo (): @[FlexibleNullability] kotlin.String? declared in <root>.RightElvisOperand' type=@[FlexibleNullability] kotlin.String? origin=null
+            BRANCH
+              if: CONST Boolean type=kotlin.Boolean value=true
+              then: GET_VAR 'val tmp_0: kotlin.String? [val] declared in <root>.test' type=kotlin.String? origin=null

compiler/testData/ir/irText/types/nullChecks/nullCheckInElvisRhs.fir.kt.txt

@@ -0,0 +1,17 @@
+// MODULE: lib
+// MODULE: main
+// FILE: nullCheckInElvisRhs.kt
+
+fun baz(): String? {
+  return null
+}
+
+fun test(): String {
+  return { // BLOCK
+    val <elvis>: String? = baz()
+    when {
+      EQEQ(arg0 = <elvis>, arg1 = null) -> foo() /*!! String */
+      else -> <elvis>
+    }
+  }
+}

compiler/testData/ir/irText/types/nullChecks/nullCheckInElvisRhs.ir.txt

@@ -0,0 +1,23 @@
+Module: lib
+Module: main
+FILE fqName:<root> fileName:/nullCheckInElvisRhs.kt
+  FUN name:baz visibility:public modality:FINAL <> () returnType:kotlin.String?
+    BLOCK_BODY
+      RETURN type=kotlin.Nothing from='public final fun baz (): kotlin.String? declared in <root>'
+        CONST Null type=kotlin.Nothing? value=null
+  FUN name:test visibility:public modality:FINAL <> () returnType:kotlin.String
+    BLOCK_BODY
+      RETURN type=kotlin.Nothing from='public final fun test (): kotlin.String declared in <root>'
+        BLOCK type=kotlin.String origin=ELVIS
+          VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:kotlin.String? [val]
+            CALL 'public final fun baz (): kotlin.String? declared in <root>' type=kotlin.String? origin=null
+          WHEN type=kotlin.String origin=null
+            BRANCH
+              if: CALL 'public final fun EQEQ (arg0: kotlin.Any?, arg1: kotlin.Any?): kotlin.Boolean declared in kotlin.internal.ir' type=kotlin.Boolean origin=EQEQ
+                arg0: GET_VAR 'val tmp_0: kotlin.String? [val] declared in <root>.test' type=kotlin.String? origin=null
+                arg1: CONST Null type=kotlin.Nothing? value=null
+              then: TYPE_OP type=kotlin.String origin=IMPLICIT_NOTNULL typeOperand=kotlin.String
+                CALL 'public/*package*/ open fun foo (): @[FlexibleNullability] kotlin.String? declared in <root>.RightElvisOperand' type=@[FlexibleNullability] kotlin.String? origin=null
+            BRANCH
+              if: CONST Boolean type=kotlin.Boolean value=true
+              then: GET_VAR 'val tmp_0: kotlin.String? [val] declared in <root>.test' type=kotlin.String? origin=null

compiler/testData/ir/irText/types/nullChecks/nullCheckInElvisRhs.kt

@@ -0,0 +1,17 @@
+// TARGET_BACKEND: JVM
+
+// MODULE: lib
+// FILE: RightElvisOperand.java
+
+class RightElvisOperand {
+    static String foo() {
+        return null;
+    }
+}
+
+// MODULE: main(lib)
+// FILE: nullCheckInElvisRhs.kt
+
+fun baz(): String? = null
+
+fun test(): String = baz() ?: RightElvisOperand.foo()

compiler/testData/ir/irText/types/nullChecks/nullCheckInElvisRhs.kt.txt

@@ -0,0 +1,18 @@
+// MODULE: lib
+// MODULE: main
+// FILE: nullCheckInElvisRhs.kt
+
+fun baz(): String? {
+  return null
+}
+
+fun test(): String {
+  return { // BLOCK
+    val tmp0_elvis_lhs: String? = baz()
+    when {
+      EQEQ(arg0 = tmp0_elvis_lhs, arg1 = null) -> foo() /*!! String */
+      else -> tmp0_elvis_lhs
+    }
+  }
+}
+