Do not box primitives in a single-entry string template expression

compiler/backend/src/org/jetbrains/kotlin/codegen/ExpressionCodegen.java

@@ -808,7 +808,7 @@ public class ExpressionCodegen extends KtVisitor<StackValue, StackValue> impleme
             StringTemplateEntry entry = entries.get(0);
             if (entry instanceof StringTemplateEntry.Expression) {
                 KtExpression expr = ((StringTemplateEntry.Expression) entry).expression;
-                return genToString(gen(expr), type);
+                return genToString(gen(expr), expressionType(expr));
             }
             else {
                 return StackValue.constant(((StringTemplateEntry.Constant) entry).value, type);

compiler/testData/codegen/bytecodeText/stringOperations/primitivesAsStringTemplates.kt

@@ -0,0 +1,9 @@
+fun test(b: Byte, s: Short, i: Int, l: Long) {
+    "$b"
+    "$s"
+    "$i"
+    "$l"
+}
+
+// 4 valueOf
+// 4 INVOKESTATIC java/lang/String.valueOf

compiler/tests/org/jetbrains/kotlin/codegen/BytecodeTextTestGenerated.java

@@ -2747,6 +2747,11 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
         public void testPrimitiveToString() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/stringOperations/primitiveToString.kt");
         }
+
+        @TestMetadata("primitivesAsStringTemplates.kt")
+        public void testPrimitivesAsStringTemplates() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/stringOperations/primitivesAsStringTemplates.kt");
+        }
     }
 
     @TestMetadata("compiler/testData/codegen/bytecodeText/varargs")