[lworld] RFR: 8376221: [lworld] Do not store array of InlineLayoutInfo for all InstanceKlasses

[Joel Sikström]

Hello,

Please refer to the JBS issue for a more detailed description of the background of this change. In summary, I suggest we only keep the array of InlineLayoutInfo for InstanceKlasses which need it, which are Klasses that have fields that have been inlined.

To make the transition to this easier, I suggest we change the following properties in FieldLayoutBuilder: 

_has_inline_type_fields
_has_flattening_information

to

_has_inlineable_fields
_has_inlined_fields

The `_has_inlineable_fields` property is only used for printing and `_has_inlined_fields` is the property we expose out to the ClassFileParser, telling us that this class has inlined fields, so the array of InlineLayoutInfo must be "preserved" and is possible to read from. Hence, the array is now only safe to access if `InstanceKlass::has_inlined_fields` is true, or simply if the actual field being accessed is flat (`fieldDescriptor::is_flat`).

I only found one place (in ciReplay.cpp) where we access the array of InlineLayoutInfo even though we might not have any inlined fields and only fields that are inlineable. I've changed this to use the normal "reference" path for fields that aren't flat.

Testing:
* Oracle's tier1-5, hotspot_valhalla and jdk_valhalla

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Commit messages:
 - 8376221: [lworld] Do not store array of InlineLayoutInfo for all InstanceKlasses

Changes: https://git.openjdk.org/valhalla/pull/1966/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1966&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8376221
  Stats: 108 lines in 11 files changed: 43 ins; 24 del; 41 mod
  Patch: https://git.openjdk.org/valhalla/pull/1966.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1966/head:pull/1966

PR: https://git.openjdk.org/valhalla/pull/1966