Bug 1355479 - Flatten attribute storage in the HTML parser to AutoTArray to avoid malloc.

- Removes nsHtml5ReleasableAttributeName
- Adds nsHtml5AttributeEntry.h
- Makes nsHtml5HtmlAttributes no longer gentered.

Tag UXP Issue #1344

parser/html/moz.build

@@ -19,6 +19,8 @@ EXPORTS += [
     'nsHtml5AtomList.h',
     'nsHtml5Atoms.h',
     'nsHtml5AtomTable.h',
+    'nsHtml5AttributeEntry.h',
+    'nsHtml5AttributeName.h',
     'nsHtml5ByteReadable.h',
     'nsHtml5DependentUTF16Buffer.h',
     'nsHtml5DocumentBuilder.h',
@@ -71,7 +73,6 @@ UNIFIED_SOURCES += [
     'nsHtml5Parser.cpp',
     'nsHtml5PlainTextUtils.cpp',
     'nsHtml5Portability.cpp',
-    'nsHtml5ReleasableAttributeName.cpp',
     'nsHtml5Speculation.cpp',
     'nsHtml5SpeculativeLoad.cpp',
     'nsHtml5StackNode.cpp',