Souper says:

; Function: fn1
%0:i32 = var 
%1:i1 = eq 0:i32, %0
%2:i32 = addnsw 1:i32, %0
%3:i32 = select %1, %2, 0:i32
%4:i1 = slt %3, 2:i32
cand %4 1:i1

COMMAND: /home/regehr/souper/build/souper -stp-path=/usr/local/bin/stp reduce_187/foo.bc

LLVM says:

define void @fn1() #0 {
entry:
  store i32 0, i32* @a, align 4, !tbaa !1
  br label %for.body

for.body:                                         ; preds = %entry, %for.body
  %storemerge1 = phi i32 [ 0, %entry ], [ %inc., %for.body ]
  %tobool = icmp eq i32 %storemerge1, 0
  %inc = add nsw i32 %storemerge1, 1
  %inc. = select i1 %tobool, i32 %inc, i32 0
  %cmp = icmp slt i32 %inc., 2
  br i1 %cmp, label %for.body, label %for.end

for.end:                                          ; preds = %for.body
  %inc..lcssa = phi i32 [ %inc., %for.body ]
  store i32 %inc..lcssa, i32* @a, align 4, !tbaa !1
  ret void
}

COMMAND: /home/regehr/souper/third_party/llvm/Debug/bin/clang -c -w -emit-llvm -O3 reduce_187/foo.c -o reduce_187/foo.bc

C source code:

int a;
void fn1() {
lbl_2195:
  for (a = 0; a <= 1; ++a)
    if (a)
      goto lbl_2195;
}

x86-64 from LLVM:

fn1:                                    # @fn1
	movl	$0, a(%rip)
	xorl	%eax, %eax
	xorl	%ecx, %ecx
.LBB0_1:                                # %for.body
	testl	%ecx, %ecx
	leal	1(%rcx), %ecx
	cmovnel	%eax, %ecx
	cmpl	$2, %ecx
	jl	.LBB0_1
	movl	%ecx, a(%rip)
	retq

COMMAND: /home/regehr/souper/third_party/llvm/Debug/bin/clang -w -O3 reduce_187/foo.c -S -o -

x86-64 from GCC:

fn1:
.L2:
.L3:
	jmp	.L3

COMMAND: gcc -w -O3 reduce_187/foo.c -S -o -