[test] Fix source positions in bytecode expectations

Fix a cctest/test-bytecode-generator/PrivateMethods mismatch between the
PrivateMethods source string and the snippet in the golden file due to
missing newline at the end of the string. Change C++ raw string back to
a normal string since in this case it makes it harder to see the
problem.

Change-Id: I3bea8873d37fbacac65548be8261f6b04104132f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1709413
Auto-Submit: Dan Elphick <delphick@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62823}

test/cctest/interpreter/bytecode_expectations/PrivateMethods.golden

@@ -52,7 +52,7 @@ bytecodes: [
                 B(Star), R(3),
   /*  133 E> */ B(CallProperty0), R(3), R(1), U8(4),
                 B(LdaUndefined),
-  /*  143 S> */ B(Return),
+  /*  144 S> */ B(Return),
 ]
 constant pool: [
   SCOPE_INFO_TYPE,
@@ -138,7 +138,7 @@ bytecodes: [
                 B(Star), R(5),
   /*  232 E> */ B(CallProperty0), R(5), R(2), U8(4),
                 B(LdaUndefined),
-  /*  242 S> */ B(Return),
+  /*  243 S> */ B(Return),
 ]
 constant pool: [
   SCOPE_INFO_TYPE,

test/cctest/interpreter/test-bytecode-generator.cc

@@ -2765,29 +2765,31 @@ TEST(PrivateMethods) {
   BytecodeExpectationsPrinter printer(CcTest::isolate());
 
   const char* snippets[] = {
-      R"({
-  class A {
-    #a() { return 1; }
-    callA() { return this.#a(); }
-  }
-
-  const a = new A;
-  a.callA();
-})",
-      R"({
-  class D {
-    #d() { return 1; }
-    callD() { return this.#d(); }
-  }
+      "{\n"
+      "  class A {\n"
+      "    #a() { return 1; }\n"
+      "    callA() { return this.#a(); }\n"
+      "  }\n"
+      "\n"
+      "  const a = new A;\n"
+      "  a.callA();\n"
+      "}\n",
 
-  class E extends D {
-    #e() { return 2; }
-    callE() { return this.callD() + this.#e(); }
-  }
+      "{\n"
+      "  class D {\n"
+      "    #d() { return 1; }\n"
+      "    callD() { return this.#d(); }\n"
+      "  }\n"
+      "\n"
+      "  class E extends D {\n"
+      "    #e() { return 2; }\n"
+      "    callE() { return this.callD() + this.#e(); }\n"
+      "  }\n"
+      "\n"
+      "  const e = new E;\n"
+      "  e.callE();\n"
+      "}\n"};
 
-  const e = new E;
-  e.callE();
-})"};
   CHECK(CompareTexts(BuildActual(printer, snippets),
                      LoadGolden("PrivateMethods.golden")));
   i::FLAG_harmony_private_methods = old_methods_flag;