Sink all InitializePasses.h includes

This file lists every pass in LLVM, and is included by Pass.h, which is
very popular. Every time we add, remove, or rename a pass in LLVM, it
caused lots of recompilation.

I found this fact by looking at this table, which is sorted by the
number of times a file was changed over the last 100,000 git commits
multiplied by the number of object files that depend on it in the
current checkout:
  recompiles    touches affected_files  header
  342380        95      3604    llvm/include/llvm/ADT/STLExtras.h
  314730        234     1345    llvm/include/llvm/InitializePasses.h
  307036        118     2602    llvm/include/llvm/ADT/APInt.h
  213049        59      3611    llvm/include/llvm/Support/MathExtras.h
  170422        47      3626    llvm/include/llvm/Support/Compiler.h
  162225        45      3605    llvm/include/llvm/ADT/Optional.h
  158319        63      2513    llvm/include/llvm/ADT/Triple.h
  140322        39      3598    llvm/include/llvm/ADT/StringRef.h
  137647        59      2333    llvm/include/llvm/Support/Error.h
  131619        73      1803    llvm/include/llvm/Support/FileSystem.h

Before this change, touching InitializePasses.h would cause 1345 files
to recompile. After this change, touching it only causes 550 compiles in
an incremental rebuild.

Reviewers: bkramer, asbirlea, bollu, jdoerfert

Differential Revision: https://reviews.llvm.org/D70211

5 files changed, 14 insertions, 4 deletions

diff --git a/llvm/lib/IR/Core.cpp b/llvm/lib/IR/Core.cpp
index d7b86d33a3d..fa8d2acd963 100644
--- a/llvm/lib/IR/Core.cpp
+++ b/llvm/lib/IR/Core.cpp
@@ -27,6 +27,7 @@
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/LegacyPassManager.h"
 #include "llvm/IR/Module.h"
+#include "llvm/InitializePasses.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
diff --git a/llvm/lib/IR/Dominators.cpp b/llvm/lib/IR/Dominators.cpp
index 910a41050b9..03dc4da273a 100644
--- a/llvm/lib/IR/Dominators.cpp
+++ b/llvm/lib/IR/Dominators.cpp
@@ -21,6 +21,7 @@
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/PassManager.h"
+#include "llvm/InitializePasses.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/GenericDomTreeConstruction.h"
@@ -357,6 +358,11 @@ PreservedAnalyses DominatorTreeVerifierPass::run(Function &F,
 //===----------------------------------------------------------------------===//
 
 char DominatorTreeWrapperPass::ID = 0;
+
+DominatorTreeWrapperPass::DominatorTreeWrapperPass() : FunctionPass(ID) {
+  initializeDominatorTreeWrapperPassPass(*PassRegistry::getPassRegistry());
+}
+
 INITIALIZE_PASS(DominatorTreeWrapperPass, "domtree",
                 "Dominator Tree Construction", true, true)
 
diff --git a/llvm/lib/IR/IRPrintingPasses.cpp b/llvm/lib/IR/IRPrintingPasses.cpp
index 75850b403fb..8fa97a3aecb 100644
--- a/llvm/lib/IR/IRPrintingPasses.cpp
+++ b/llvm/lib/IR/IRPrintingPasses.cpp
@@ -14,6 +14,7 @@
 #include "llvm/IR/Function.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/PassManager.h"
+#include "llvm/InitializePasses.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
diff --git a/llvm/lib/IR/SafepointIRVerifier.cpp b/llvm/lib/IR/SafepointIRVerifier.cpp
index c90347ec48f..f9578394a82 100644
--- a/llvm/lib/IR/SafepointIRVerifier.cpp
+++ b/llvm/lib/IR/SafepointIRVerifier.cpp
@@ -30,6 +30,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/IR/SafepointIRVerifier.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/PostOrderIterator.h"
 #include "llvm/ADT/SetOperations.h"
@@ -38,14 +39,14 @@
 #include "llvm/IR/Dominators.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/Instructions.h"
-#include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/Module.h"
-#include "llvm/IR/Value.h"
-#include "llvm/IR/SafepointIRVerifier.h"
 #include "llvm/IR/Statepoint.h"
-#include "llvm/Support/Debug.h"
+#include "llvm/IR/Value.h"
+#include "llvm/InitializePasses.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
 
 #define DEBUG_TYPE "safepoint-ir-verifier"
diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index e89d8b0a9b5..1549fbf427e 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -96,6 +96,7 @@
 #include "llvm/IR/Use.h"
 #include "llvm/IR/User.h"
 #include "llvm/IR/Value.h"
+#include "llvm/InitializePasses.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/AtomicOrdering.h"
 #include "llvm/Support/Casting.h"