JVM_IR fix string concatenation performance issues

KT-50080 KT-50084 KT-50140

compiler/testData/codegen/box/strings/concatGenericWithNullablePrimitiveUpperBound.kt

@@ -0,0 +1,31 @@
+// KOTLIN_CONFIGURATION_FLAGS: STRING_CONCAT=inline
+// WITH_STDLIB
+
+// IGNORE_BACKEND: WASM
+//  ^  wasm-function[2283]:0x218da: RuntimeError: wasm exception
+
+import kotlin.test.assertEquals
+
+fun <T : Boolean?> concatNBoolean(x: T) = "[[$x]]"
+fun <T : Byte?> concatNByte(x: T) = "[[$x]]"
+fun <T : Short?> concatNShort(x: T) = "[[$x]]"
+fun <T : Int?> concatNInt(x: T) = "[[$x]]"
+fun <T : Long?> concatNLong(x: T) = "[[$x]]"
+fun <T : Float?> concatNFloat(x: T) = "[[$x]]"
+fun <T : Double?> concatNDouble(x: T) = "[[$x]]"
+
+fun box(): String {
+    assertEquals("[[true]]", concatNBoolean(true))
+    assertEquals("[[0]]", concatNByte(0.toByte()))
+    assertEquals("[[1]]", concatNShort(1.toShort()))
+    assertEquals("[[2]]", concatNInt(2))
+    assertEquals("[[3]]", concatNLong(3L))
+    assertEquals("[[4.4]]", concatNFloat(4.4f))
+    assertEquals("[[5.5]]", concatNFloat(5.5f))
+
+    return "OK"
+}
+
+// CHECK_BYTECODE_TEXT
+// JVM_IR_TEMPLATES
+// 7 INVOKEVIRTUAL java/lang/StringBuilder\.append \(Ljava/lang/Object;\)Ljava/lang/StringBuilder;