test: update postmortem metadata test for V8 6.9

The V8 6.9 update requires the following adjustments to the
postmortem debugging metadata constants:

- v8dbg_class_SharedFunctionInfo__function_identifier__Object
  Use: v8dbg_class_UncompiledData__inferred_name__String

- v8dbg_class_SharedFunctionInfo__script__Object
  Use: v8dbg_class_SharedFunctionInfo__script_or_debug_info__Object

- v8dbg_class_SharedFunctionInfo__end_position__int
  Use: v8dbg_class_UncompiledData__end_position__int32_t

- v8dbg_class_SharedFunctionInfo__start_position_and_type__int
  Use: v8dbg_class_UncompiledData__start_position__int32_t

- v8dbg_sharedfunctioninfo_start_position_mask and
- v8dbg_sharedfunctioninfo_start_position_shift
  Removed. Use: v8dbg_class_UncompiledData__start_position__int32_t

Refs: v8/v8@39e2d97#diff-f3f182b0510ba2ee39ae87e421ff110b

test/v8-updates/test-postmortem-metadata.js

@@ -95,12 +95,12 @@ function getExpectedSymbols() {
     'v8dbg_class_SeqTwoByteString__chars__char',
     'v8dbg_class_SharedFunctionInfo__function_data__Object',
     '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',
+    'v8dbg_class_UncompiledData__end_position__int32_t',
+    'v8dbg_class_UncompiledData__inferred_name__String',
+    'v8dbg_class_SharedFunctionInfo__internal_formal_parameter_count__uint16_t',
     'v8dbg_class_SharedFunctionInfo__name_or_scope_info__Object',
-    'v8dbg_class_SharedFunctionInfo__script__Object',
-    'v8dbg_class_SharedFunctionInfo__start_position_and_type__int',
+    'v8dbg_class_SharedFunctionInfo__script_or_debug_info__Object',
+    'v8dbg_class_UncompiledData__start_position__int32_t',
     'v8dbg_class_SlicedString__offset__SMI',
     'v8dbg_class_SlicedString__parent__String',
     'v8dbg_class_String__length__SMI',
@@ -151,8 +151,6 @@ function getExpectedSymbols() {
     'v8dbg_scopeinfo_idx_ncontextlocals',
     'v8dbg_scopeinfo_idx_nparams',
     'v8dbg_scopeinfo_idx_nstacklocals',
-    'v8dbg_sharedfunctioninfo_start_position_mask',
-    'v8dbg_sharedfunctioninfo_start_position_shift',
     'v8dbg_type_Code__CODE_TYPE',
     'v8dbg_type_FixedArray__FIXED_ARRAY_TYPE',
     'v8dbg_type_HeapNumber__HEAP_NUMBER_TYPE',