[PATCH] D54324: [AST] Store the value of CharacterLiteral inline if possible

[Bruno Ricci via Phabricator via cfe-commits]

riccibruno created this revision.
riccibruno added a reviewer: rsmith.
riccibruno added a project: clang.
Herald added a reviewer: shafik.
Herald added a subscriber: cfe-commits.

The vast majority of `CharacterLiteral`s have a value which fits into 8 bits
(in the 2666 `CharacterLiteral`s in all of Boost, only 2 don't).
When possible, use the space in the bit-fields of `Stmt` to store the value
and otherwise store it in a trailing object.

This saves 1 pointer per `CharacterLiteral` when the value fits into 8 bits.

Note that in itself this do not save that much space, but this is part of
a larger effort to pack the statements/expressions classes.


Repository:
  rC Clang

https://reviews.llvm.org/D54324

Files:
  include/clang/AST/Expr.h
  include/clang/AST/Stmt.h
  lib/AST/ASTImporter.cpp
  lib/AST/Expr.cpp
  lib/Sema/SemaExpr.cpp
  lib/Sema/SemaTemplate.cpp
  lib/Serialization/ASTReaderStmt.cpp

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