[clang] Add plugin ActionType to run command line plugin before main action

Currently we have a way to run a plugin if specified on the command line
after the main action, and ways to unconditionally run the plugin before
or after the main action, but no way to run a plugin if specified on the
command line before the main action.

This introduces the missing option.

This is helpful because -clear-ast-before-backend clears the AST before
codegen, while some plugins may want access to the AST.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D112096

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp b/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
index dc8409f..8e18f33 100644
--- a/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
+++ b/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
@@ -79,7 +79,7 @@ CreateFrontendBaseAction(CompilerInstance &CI) {
       if (Plugin.getName() == CI.getFrontendOpts().ActionName) {
         std::unique_ptr<PluginASTAction> P(Plugin.instantiate());
         if ((P->getActionType() != PluginASTAction::ReplaceAction &&
-             P->getActionType() != PluginASTAction::Cmdline) ||
+             P->getActionType() != PluginASTAction::CmdlineAfterMainAction) ||
             !P->ParseArgs(
                 CI,
                 CI.getFrontendOpts().PluginArgs[std::string(Plugin.getName())]))