Add test on bytecode text

Test data should be a Kotlin source file with zero or more comments e.g. of
the form: '// 1 INVOKEVIRTUAL'. The test then checks that the generated
bytecode for this file contains exactly one occurrence of the string
'INVOKEVIRTUAL'

compiler/testData/codegen/bytecodeText/kt2887.kt

@@ -0,0 +1,17 @@
+open class Base<T> {
+    public open fun foo(t: T): T = t
+    
+    public open fun bar() {}
+}
+
+class Child: Base<String>() {
+    override fun foo(t: String): String {
+        return super<Base>.foo(t)
+    }
+    
+    override fun bar() {
+        super.bar()
+    }
+}
+
+// 1 bridge