Subzero: Don't "and" i1 values with 1.

tests_lit/llvm2ice_tests/64bit.pnacl.ll

 ; This tries to be a comprehensive test of i64 operations, in
 ; particular the patterns for lowering i64 operations into constituent
 ; i32 operations on x86-32.
 
 ; RUN: %if --need=target_X8632 --command %p2i --filetype=obj --disassemble \
 ; RUN:   --target x8632 -i %s --args -O2 -allow-externally-defined-symbols \
 ; RUN:   | %if --need=target_X8632 --command FileCheck %s
 
 ; RUN: %if --need=target_X8632 --command %p2i --filetype=obj --disassemble \
 ; RUN:   --target x8632 -i %s --args -Om1 -allow-externally-defined-symbols \
@@ skipping 823 matching lines @@
 define internal i32 @trunc64To1(i64 %a) {
 entry:
 ;  %tobool = icmp ne i64 %a, 0
   %tobool = trunc i64 %a to i1
   %tobool.ret_ext = zext i1 %tobool to i32
   ret i32 %tobool.ret_ext
 }
 ; CHECK-LABEL: trunc64To1
 ; CHECK:      mov     eax,DWORD PTR [esp+0x4]
 ; CHECK:      and     eax,0x1
-; CHECK:      and     eax,0x1
+; CHECK-NOT:  and     eax,0x1
 ;
 ; OPTM1-LABEL: trunc64To1
 ; OPTM1:      mov     eax,DWORD PTR [esp+
 ; OPTM1:      and     eax,0x1
-; OPTM1:      and     eax,0x1
+; OPTM1-NOT:  and     eax,0x1
 
 ; ARM32-LABEL: trunc64To1
 ; ARM32: and r0, r0, #1
 ; ARM32: and r0, r0, #1
 
 define internal i64 @sext32To64(i32 %a) {
 entry:
   %conv = sext i32 %a to i64
   ret i64 %conv
 }
@@ skipping 950 matching lines @@
 ; CHECK-LABEL: phi64Undef
 ; CHECK: mov {{.*}},0x0
 ; CHECK: mov {{.*}},0x0
 ; OPTM1-LABEL: phi64Undef
 ; OPTM1: mov {{.*}},0x0
 ; OPTM1: mov {{.*}},0x0
 ; ARM32-LABEL: phi64Undef
 ; ARM32: mov {{.*}} #0
 ; ARM32: mov {{.*}} #0