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/componentEvaluatesOnlyOnce.kt

@@ -14,4 +14,6 @@ class Tester() {
   fun S.component4() = ((a + b) as java.lang.String).substring(2)
 }
 
-fun box() = Tester().box()
+fun box() = Tester().box()
+
+// 1 NEW S

compiler/testData/codegen/bytecodeText/intConstantNotNull.kt

@@ -0,0 +1,3 @@
+fun foo() = 10!!.toString()
+
+// 0 IFNONNULL

compiler/testData/codegen/bytecodeText/intConstantNullable.kt

@@ -0,0 +1,5 @@
+val a : Int? = 10
+
+fun foo() = a!!.toString()
+
+// 1 IFNONNULL

compiler/testData/codegen/bytecodeText/intConstantNullableSafeCall.kt

@@ -0,0 +1,5 @@
+val a : Int? = 10
+
+fun foo() = a?.toString()
+
+// 1 IFNULL

compiler/testData/codegen/bytecodeText/intConstantSafeCall.kt

@@ -0,0 +1,3 @@
+fun foo() = 10?.toString()
+
+// 0 IFNULL

compiler/testData/codegen/bytecodeText/kt2202.kt

@@ -15,4 +15,7 @@ class B {
     fun foo() {
        foo = 2
     }
-}
+}
+
+// 0 INVOKEVIRTUAL
+// 4 INVOKESPECIAL

compiler/testData/codegen/bytecodeText/kt2887.kt

@@ -12,5 +12,6 @@ class Child: Base<String>() {
     override fun bar() {
         super.bar()
     }
-
 }
+
+// 1 bridge

compiler/testData/codegen/bytecodeText/privateDefaultArgs.kt

@@ -11,3 +11,6 @@ class B {
 fun box(): String {
     return "OK"
 }
+
+// 0 INVOKEVIRTUAL
+// 3 INVOKESPECIAL

compiler/testData/codegen/bytecodeText/statements/ifSingleBranch.kt

@@ -7,3 +7,5 @@ fun foo() {
         return
     }
 }
+
+// 0 GETSTATIC

compiler/testData/codegen/bytecodeText/statements/ifThenElse.kt

@@ -7,3 +7,5 @@ fun foo(b: Boolean) {
         z(b)
     }
 }
+
+// 0 GETSTATIC

compiler/testData/codegen/bytecodeText/statements/ifThenElseEmpty.kt

@@ -3,3 +3,5 @@ fun foo(b: Boolean) {
     } else {
     }
 }
+
+// 0 GETSTATIC

compiler/testData/codegen/bytecodeText/statements/tryCatchFinally.kt

@@ -21,3 +21,5 @@ fun foo() {
         z()
     }
 }
+
+// 0 GETSTATIC

compiler/testData/codegen/bytecodeText/statements/when.kt

@@ -7,3 +7,5 @@ fun foo(x: Int) {
         else -> {}
     }
 }
+
+// 0 GETSTATIC

compiler/testData/codegen/bytecodeText/statements/whenSubject.kt

@@ -7,3 +7,5 @@ fun foo(x: Int) {
         else -> {}
     }
 }
+
+// 0 GETSTATIC