test: update postmortem metadata test

This commit updates the following postmortem metadata constant:

- v8dbg_class_SharedFunctionInfo__compiler_hints__int
  - Renamed: v8dbg_class_SharedFunctionInfo__flags__int
  - V8 commit: v8/v8@071b01b#diff-f3f182b0510ba2ee39ae87e421ff110b

Fixes: nodejs/node-v8#48

test/parallel/test-postmortem-metadata.js

@@ -94,7 +94,7 @@ function getExpectedSymbols() {
     'v8dbg_class_SeqOneByteString__chars__char',
     'v8dbg_class_SeqTwoByteString__chars__char',
     'v8dbg_class_SharedFunctionInfo__function_data__Object',
-    'v8dbg_class_SharedFunctionInfo__compiler_hints__int',
+    'v8dbg_class_SharedFunctionInfo__flags__int',
     'v8dbg_class_SharedFunctionInfo__end_position__int',
     'v8dbg_class_SharedFunctionInfo__function_identifier__Object',
     'v8dbg_class_SharedFunctionInfo__internal_formal_parameter_count__int',