[MachineFunctionPass] Support -print-changed and -print-changed=quiet

-print-changed for new pass manager is handy beside -print-after-all.
Port it to MachineFunctionPass.

Note: lib/Passes/StandardInstrumentations.cpp implements a number of
misc features. If we want to use them for codegen, we may need to lift
some functionality to LLVMIR.

Reviewed By: aeubanks, jamieschmeiser

Differential Revision: https://reviews.llvm.org/D130434

1 files changed, 15 insertions, 0 deletions

diff --git a/llvm/include/llvm/IR/PrintPasses.h b/llvm/include/llvm/IR/PrintPasses.h
index 1fa7c18..e721db9 100644
--- a/llvm/include/llvm/IR/PrintPasses.h
+++ b/llvm/include/llvm/IR/PrintPasses.h
@@ -10,10 +10,25 @@
 #define LLVM_IR_PRINTPASSES_H
 
 #include "llvm/ADT/StringRef.h"
+#include "llvm/Support/CommandLine.h"
 #include <vector>
 
 namespace llvm {
 
+enum class ChangePrinter {
+  None,
+  Verbose,
+  Quiet,
+  DiffVerbose,
+  DiffQuiet,
+  ColourDiffVerbose,
+  ColourDiffQuiet,
+  DotCfgVerbose,
+  DotCfgQuiet
+};
+
+extern cl::opt<ChangePrinter> PrintChanged;
+
 // Returns true if printing before/after some pass is enabled, whether all
 // passes or a specific pass.
 bool shouldPrintBeforeSomePass();