JVM_IR more compact safe call chains (almost as old BE)

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

@@ -0,0 +1,17 @@
+class A(val b: B)
+class B(val c: C)
+class C(val s: String)
+
+fun test(na: A?) =
+    na?.b?.c?.s
+
+// 1 POP
+// 1 ACONST_NULL
+
+// JVM_IR_TEMPLATES
+// 1 DUP
+// 1 IFNULL
+
+// JVM_TEMPLATES
+// 3 DUP
+// 3 IFNULL

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

@@ -0,0 +1,11 @@
+fun test(a: Any?, b: Any?, c: String) =
+    a?.toString() ?: b?.toString() ?: c
+
+// 2 IFNULL
+// 1 ACONST_NULL
+
+// JVM_IR_TEMPLATES
+// 1 IFNONNULL
+
+// JVM_TEMPLATES
+// 2 IFNONNULL

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

@@ -0,0 +1,17 @@
+fun test(a: Any?) =
+    a?.toString()?.hashCode() ?: 0
+
+// 1 ALOAD
+// 0 ASTORE
+// 0 ISTORE
+// 0 ILOAD
+// 1 POP
+// 0 valueOf
+
+// JVM_IR_TEMPLATES
+// 1 DUP
+// 1 IFNULL
+
+// JVM_TEMPLATES
+// 2 DUP
+// 2 IFNULL