[PATCH] D34256: [PR33394] Avoid lexing editor placeholders when running the preprocessor only

[Alex Lorenz via Phabricator via cfe-commits]

arphaman created this revision.

r300667 added support for editor placeholder to Clang. That commit didn’t take into account that users who use Clang for preprocessing only (-E) will get the “editor placeholder in source file” error when preprocessing their source (PR33394).

This commit ensures that Clang doesn't lex editor placeholders when running a preprocessor only action. It also ensures that tokens like `<#>` and `<##>` won't form valid placeholders.

rdar://32718000


Repository:
  rL LLVM

https://reviews.llvm.org/D34256

Files:
  include/clang/Lex/PreprocessorOptions.h
  lib/Frontend/CompilerInvocation.cpp
  lib/Lex/Lexer.cpp
  test/Frontend/pp-only-no-editor-placeholders.c
  test/Parser/editor-placeholder-recovery.cpp

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