[layoutng] Use partition alloc for NGInlineLayoutStateStack

Also mark NGInlineBoxState as not heap allocated.

R=kojii@chromium.org

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: I0c605c6123cab202190e9415cc9cb9a81d0cd832
Reviewed-on: https://chromium-review.googlesource.com/1237237
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593062}

third_party/blink/renderer/core/layout/ng/inline/ng_inline_box_state.h

@@ -34,6 +34,9 @@ struct NGPendingPositions {
 // require ancestor position or size.
 // This is a transient object only while building line boxes in a block.
 struct NGInlineBoxState {
+  DISALLOW_NEW();
+
+ public:
   unsigned fragment_start = 0;
   const NGInlineItem* item = nullptr;
   const ComputedStyle* style = nullptr;
@@ -108,6 +111,8 @@ struct NGInlineBoxState {
 // 2) Performs layout when the positin/size of a box was computed.
 // 3) Cache common values for a box.
 class CORE_EXPORT NGInlineLayoutStateStack {
+  USING_FAST_MALLOC(NGInlineLayoutStateStack);
+
  public:
   // The box state for the line box.
   NGInlineBoxState& LineBoxState() { return stack_.front(); }