Prepare for making SwitchInstProfUpdateWrapper strict

This patch removes the test part that relates to the non-strict
behavior of SwitchInstProfUpdateWrapper and changes
the assertion to llvm_unreachable() to allow the check in
release builds.
This patch prepares SwitchInstProfUpdateWrapper to become
strict with one line change. That is need to revert it easily
if any failure will arise.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@365439 91177308-0d34-0410-b5e6-96231b3b80d8

lib/IR/Instructions.cpp

@@ -3913,9 +3913,8 @@ void SwitchInstProfUpdateWrapper::init() {
   if (ProfileData->getNumOperands() != SI.getNumSuccessors() + 1) {
     State = Invalid;
     if (SwitchInstProfUpdateWrapperStrict)
-      assert(false &&
-             "number of prof branch_weights metadata operands corresponds to"
-             " number of succesors");
+      llvm_unreachable("number of prof branch_weights metadata operands does "
+                       "not correspond to number of succesors");
     return;
   }
 

unittests/IR/InstructionsTest.cpp

@@ -792,44 +792,6 @@ TEST(InstructionsTest, SwitchInstProfUpdateWrapper) {
     EXPECT_EQ(*SIW.getSuccessorWeight(1), 11u);
     EXPECT_EQ(*SIW.getSuccessorWeight(2), 22u);
   }
-
-  // Make prof data invalid by adding one extra weight.
-  SI->setMetadata(LLVMContext::MD_prof, MDBuilder(C).createBranchWeights(
-                                            { 99, 11, 22, 33 })); // extra
-  { // Invalid prof data makes wrapper act as if there were no prof data.
-    SwitchInstProfUpdateWrapper SIW(*SI);
-    ASSERT_FALSE(SIW.getSuccessorWeight(0).hasValue());
-    ASSERT_FALSE(SIW.getSuccessorWeight(1).hasValue());
-    ASSERT_FALSE(SIW.getSuccessorWeight(2).hasValue());
-    SIW.addCase(ConstantInt::get(Int32Ty, 3), BB3.get(), 39);
-    ASSERT_FALSE(SIW.getSuccessorWeight(3).hasValue()); // did not add weight 39
-  }
-
-  { // With added 3rd case the prof data become consistent with num of cases.
-    SwitchInstProfUpdateWrapper SIW(*SI);
-    EXPECT_EQ(*SIW.getSuccessorWeight(0), 99u);
-    EXPECT_EQ(*SIW.getSuccessorWeight(1), 11u);
-    EXPECT_EQ(*SIW.getSuccessorWeight(2), 22u);
-    EXPECT_EQ(*SIW.getSuccessorWeight(3), 33u);
-  }
-
-  // Make prof data invalid by removing one extra weight.
-  SI->setMetadata(LLVMContext::MD_prof,
-                  MDBuilder(C).createBranchWeights({ 99, 11, 22 })); // shorter
-  { // Invalid prof data makes wrapper act as if there were no prof data.
-    SwitchInstProfUpdateWrapper SIW(*SI);
-    ASSERT_FALSE(SIW.getSuccessorWeight(0).hasValue());
-    ASSERT_FALSE(SIW.getSuccessorWeight(1).hasValue());
-    ASSERT_FALSE(SIW.getSuccessorWeight(2).hasValue());
-    SIW.removeCase(SwitchInst::CaseIt(SI, 2));
-  }
-
-  { // With removed 3rd case the prof data become consistent with num of cases.
-    SwitchInstProfUpdateWrapper SIW(*SI);
-    EXPECT_EQ(*SIW.getSuccessorWeight(0), 99u);
-    EXPECT_EQ(*SIW.getSuccessorWeight(1), 11u);
-    EXPECT_EQ(*SIW.getSuccessorWeight(2), 22u);
-  }
 }
 
 TEST(InstructionsTest, CommuteShuffleMask) {