Remove br i1 undef in Lower* directory

Author: leewei05

llvm/test/Transforms/LowerConstantIntrinsics/stale-worklist-phi.ll

@@ -13,7 +13,7 @@
 
 %s = type { [2 x i16] }
 
-define fastcc void @foo(ptr %p) unnamed_addr {
+define fastcc void @foo(ptr %p, i1 %arg) unnamed_addr {
 entry:
   %0 = tail call i32 @llvm.objectsize.i32.p0(ptr %p, i1 false, i1 false, i1 false) #2
   %1 = icmp ne i32 %0, 0
@@ -24,7 +24,7 @@ for.cond:                                         ; preds = %entry
   br label %cont.i
 
 cont.i:                                           ; preds = %for.cond
-  br i1 undef, label %cont2.i, label %cont2.thread.i
+  br i1 %arg, label %cont2.i, label %cont2.thread.i
 
 cont2.thread.i:                                   ; preds = %cont.i
   br label %handler.type_mismatch3.i

llvm/test/Transforms/LowerSwitch/condition-phi-unreachable-default.ll

@@ -10,7 +10,7 @@ entry:
 
 sw.epilog:                                        ; preds = %sw.epilog.outer, %for.body
   %i = phi i32 [ undef, %for.body ], [ 0, %entry ]
-  br i1 undef, label %for.body, label %for.end
+  br i1 true, label %for.body, label %for.end
 
 for.body:                                         ; preds = %sw.epilog
   switch i32 %i, label %sw.epilog [

llvm/test/Transforms/LowerSwitch/do-not-handle-impossible-values.ll

@@ -584,7 +584,7 @@ exit:
 
 ; Check that we do not generate redundant comparisons that would have results
 ; known at compile time due to limited range of the value being switch'ed over.
-define void @test12() {
+define void @test12(i1 %arg) {
 ; CHECK-LABEL: @test12(
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
@@ -603,7 +603,7 @@ define void @test12() {
 ; CHECK-NEXT:    br label [[LATCH]]
 ; CHECK:       latch:
 ; CHECK-NEXT:    [[INC]] = add nuw nsw i32 [[INDVAR]], 1
-; CHECK-NEXT:    br i1 undef, label [[EXIT:%.*]], label [[FOR_BODY]]
+; CHECK-NEXT:    br i1 %arg, label [[EXIT:%.*]], label [[FOR_BODY]]
 ; CHECK:       exit:
 ; CHECK-NEXT:    ret void
 ;
@@ -626,7 +626,7 @@ case.2:
 
 latch:
   %inc = add nuw nsw i32 %indvar, 1
-  br i1 undef, label %exit, label %for.body
+  br i1 %arg, label %exit, label %for.body
 
 exit:
   ret void

llvm/test/Transforms/LowerSwitch/phi-in-dead-block.ll

@@ -2,9 +2,9 @@
 
 ; CHECK-LABEL: @phi_in_dead_block(
 ; CHECK-NOT: switch
-define void @phi_in_dead_block() {
+define void @phi_in_dead_block(i1 %arg) {
 bb:
-  br i1 undef, label %bb2, label %bb3
+  br i1 %arg, label %bb2, label %bb3
 
 bb1:                                              ; No predecessors!
   switch i32 undef, label %bb2 [
@@ -21,9 +21,9 @@ bb3:                                              ; preds = %bb1, %bb
 
 ; CHECK-LABEL: @phi_in_dead_block_br_to_self(
 ; CHECK-NOT: switch
-define void @phi_in_dead_block_br_to_self() {
+define void @phi_in_dead_block_br_to_self(i1 %arg) {
 bb:
-  br i1 undef, label %bb2, label %bb3
+  br i1 %arg, label %bb2, label %bb3
 
 bb1:                                              ; No predecessors!
   switch i32 undef, label %bb2 [