[DFAJumpThreading] Verify dominator tree by option (#163334)

Note that the test coverage misses the dominator tree verification. This
patch controls verification by option, instead of using the
EXPENSIVE_CHECKS macro.

Author: XChy

llvm/lib/Transforms/Scalar/DFAJumpThreading.cpp

@@ -1479,10 +1479,13 @@ bool DFAJumpThreading::run(Function &F) {
   DTU->flush();
 
 #ifdef EXPENSIVE_CHECKS
-  assert(DTU->getDomTree().verify(DominatorTree::VerificationLevel::Full));
   verifyFunction(F, &dbgs());
 #endif
 
+  if (MadeChanges && VerifyDomInfo)
+    assert(DTU->getDomTree().verify(DominatorTree::VerificationLevel::Full) &&
+           "Failed to maintain validity of domtree!");
+
   return MadeChanges;
 }
 

llvm/test/Transforms/DFAJumpThreading/dfa-constant-propagation.ll

@@ -1,5 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt -S -passes=dfa-jump-threading,sccp,simplifycfg %s | FileCheck %s
+; RUN: opt -S -passes=dfa-jump-threading,sccp,simplifycfg -verify-dom-info=1 %s | FileCheck %s
 
 ; This test checks that a constant propagation is applied for a basic loop.
 ; Related to bug 44679.

llvm/test/Transforms/DFAJumpThreading/dfa-jump-threading-analysis.ll

@@ -1,6 +1,6 @@
 ; REQUIRES: asserts
-; RUN: opt -S -passes=dfa-jump-threading -debug-only=dfa-jump-threading -disable-output %s 2>&1 | FileCheck %s
-; RUN: opt -S -passes=dfa-jump-threading -print-prof-data %s -o - | FileCheck %s --check-prefix=PROFILE
+; RUN: opt -S -passes=dfa-jump-threading -verify-dom-info=1 -debug-only=dfa-jump-threading -disable-output %s 2>&1 | FileCheck %s
+; RUN: opt -S -passes=dfa-jump-threading -verify-dom-info=1 -print-prof-data %s -o - | FileCheck %s --check-prefix=PROFILE
 
 ; This test checks that the analysis identifies all threadable paths in a
 ; simple CFG. A threadable path includes a list of basic blocks, the exit

llvm/test/Transforms/DFAJumpThreading/dfa-jump-threading-transform.ll

@@ -1,5 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals
-; RUN: opt -S -passes=dfa-jump-threading %s | FileCheck %s
+; RUN: opt -S -passes=dfa-jump-threading -verify-dom-info=1 %s | FileCheck %s
 
 ; These tests check that the DFA jump threading transformation is applied
 ; properly to two CFGs. It checks that blocks are cloned, branches are updated,

llvm/test/Transforms/DFAJumpThreading/dfa-unfold-select.ll

@@ -1,5 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt -S -passes=dfa-jump-threading -dfa-early-exit-heuristic=false %s | FileCheck %s
+; RUN: opt -S -passes=dfa-jump-threading -dfa-early-exit-heuristic=false -verify-dom-info=1 %s | FileCheck %s
 
 ; These tests check if selects are unfolded properly for jump threading
 ; opportunities. There are three different patterns to consider:

llvm/test/Transforms/DFAJumpThreading/equivalent-states.ll

@@ -1,5 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
-; RUN: opt -S -passes=dfa-jump-threading %s | FileCheck %s
+; RUN: opt -S -passes=dfa-jump-threading -verify-dom-info=1  %s | FileCheck %s
 
 declare void @do_something()
 declare void @user(i32)

llvm/test/Transforms/DFAJumpThreading/single_succ_switch.ll

@@ -1,5 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
-; RUN: opt -S -passes=dfa-jump-threading %s | FileCheck %s
+; RUN: opt -S -passes=dfa-jump-threading -verify-dom-info=1 %s | FileCheck %s
 
 define void @pr60254() {
 ; CHECK-LABEL: define void @pr60254() {