JVM_IR simplify null check on trivially initialized vals only

compiler/testData/codegen/box/safeCall/safeCallIOnUninitializedNonNullValue.kt

@@ -0,0 +1,18 @@
+abstract class Base() {
+    init {
+        foo()
+    }
+
+    abstract fun foo()
+}
+
+class Derived(val x: String) : Base() {
+    override fun foo() {
+        x?.length
+    }
+}
+
+fun box(): String {
+    Derived("")
+    return "OK"
+}

compiler/testData/codegen/bytecodeText/nullCheckOptimization/safeCallAndElvisChains.kt

@@ -14,5 +14,5 @@ class A(val x: String) {
 
 // JVM_IR_TEMPLATES
 // 4 IFNULL
-// 0 IFNONNULL
+// 2 IFNONNULL
 // 0 ACONST_NULL

compiler/testData/codegen/bytecodeText/temporaryVals/notNullReceiversInChain.kt

@@ -6,8 +6,8 @@ fun test(na: A?) =
     na?.b?.c?.s
 
 // JVM_IR_TEMPLATES
-// 1 DUP
-// 1 IFNULL
+// 3 DUP
+// 3 IFNULL
 // 0 IFNONNULL
 // 1 ACONST_NULL
 

compiler/testData/codegen/bytecodeText/temporaryVals/safeCallChain1.kt

@@ -6,6 +6,6 @@ fun test(an: A?) = an?.b?.c?.s
 
 // JVM_IR_TEMPLATES
 // 0 ASTORE
-// 1 IFNULL
+// 3 IFNULL
 // 0 IFNONNULL
 // 1 ACONST_NULL

compiler/testData/codegen/bytecodeText/temporaryVals/safeCallChainMemberExt1.kt

@@ -13,5 +13,5 @@ object Host {
 // JVM_IR_TEMPLATES
 // 0 ASTORE
 // 1 ACONST_NULL
-// 1 IFNULL
+// 3 IFNULL
 // 0 IFNONNULL

compiler/testData/codegen/bytecodeText/temporaryVals/safeCallChainMemberExt2.kt

@@ -17,5 +17,5 @@ fun test(an: A?) = an?.b?.c?.s
 // JVM_IR_TEMPLATES
 // 0 ASTORE
 // 1 ACONST_NULL
-// 1 IFNULL
+// 3 IFNULL
 // 0 IFNONNULL

compiler/testData/codegen/bytecodeText/temporaryVals/safeCallElvisSafeCallElvisSomething.kt

@@ -3,7 +3,7 @@ fun test(a: Any?, b: Any?, c: String) =
 
 // JVM_IR_TEMPLATES
 // 2 IFNULL
-// 0 IFNONNULL
+// 1 IFNONNULL
 // 0 ACONST_NULL
 
 // JVM_TEMPLATES

compiler/testData/codegen/bytecodeText/temporaryVals/safeCallWithElvis.kt

@@ -9,8 +9,8 @@ fun test(a: Any?) =
 // 0 valueOf
 
 // JVM_IR_TEMPLATES
-// 1 DUP
-// 1 IFNULL
+// 2 DUP
+// 2 IFNULL
 // 0 ACONST_NULL
 // 0 IFNONNULL