[gold] Remove support for legacy pass manager

This removes support for performing LTO using the legacy pass
manager in LLVMgold.so. Explicitly enabling the new pass manager
is retained as a no-op.

Differential Revision: https://reviews.llvm.org/D123294

1 files changed, 1 insertions, 7 deletions

diff --git a/llvm/tools/gold/gold-plugin.cpp b/llvm/tools/gold/gold-plugin.cpp
index 0477a15..019bfe0 100644
--- a/llvm/tools/gold/gold-plugin.cpp
+++ b/llvm/tools/gold/gold-plugin.cpp
@@ -200,8 +200,6 @@ namespace options {
   static std::vector<const char *> extra;
   // Sample profile file path
   static std::string sample_profile;
-  // New pass manager
-  static bool new_pass_manager = true;
   // Debug new pass manager
   static bool debug_pass_manager = false;
   // Directory to store the .dwo files.
@@ -287,9 +285,7 @@ namespace options {
     } else if (opt.consume_front("cs-profile-path=")) {
       cs_profile_path = std::string(opt);
     } else if (opt == "new-pass-manager") {
-      new_pass_manager = true;
-    } else if (opt == "legacy-pass-manager") {
-      new_pass_manager = false;
+      // We always use the new pass manager.
     } else if (opt == "debug-pass-manager") {
       debug_pass_manager = true;
     } else if (opt == "whole-program-visibility") {
@@ -956,8 +952,6 @@ static std::unique_ptr<LTO> createLTO(IndexWriteCallback OnIndexWrite,
   Conf.RemarksHotnessThreshold = options::RemarksHotnessThreshold;
   Conf.RemarksFormat = options::RemarksFormat;
 
-  // Use new pass manager if set in driver
-  Conf.UseNewPM = options::new_pass_manager;
   // Debug new pass manager if requested
   Conf.DebugPassManager = options::debug_pass_manager;