Subzero: Fix some legalization issues involving immediates.

tests_lit/llvm2ice_tests/select-opt.ll

 ; Simple test of the select instruction.  The CHECK lines are only
 ; checking for basic instruction patterns that should be present
 ; regardless of the optimization level, so there are no special OPTM1
 ; match lines.
 
 ; RUN: %llvm2ice -O2 --verbose none %s | FileCheck %s
 ; RUN: %llvm2ice -Om1 --verbose none %s | FileCheck %s
 ; RUN: %llvm2ice -O2 --verbose none %s \
 ; RUN:     | llvm-mc -triple=i686-none-nacl -x86-asm-syntax=intel -filetype=obj
 ; RUN: %llvm2ice -Om1 --verbose none %s \
@@ skipping 18 matching lines @@
 
 ; CHECK:      .globl testSelect
 ; CHECK:      cmp
 ; CHECK:      cmp
 ; CHECK:      call useInt
 ; CHECK:      cmp
 ; CHECK:      cmp
 ; CHECK:      call useInt
 ; CHECK:      ret
 
+; Check for valid addressing mode in the cmp instruction when the
+; operand is an immediate.
+define i32 @testSelectImm32(i32 %a, i32 %b) {
+entry:
+  %cond = select i1 0, i32 %a, i32 %b
+  ret i32 %cond
+}
+; CHECK-LABEL: testSelectImm32
+; CHECK-NOT: cmp {{[0-9]+}},
+
+; Check for valid addressing mode in the cmp instruction when the
+; operand is an immediate.  There is a different x86-32 lowering
+; sequence for 64-bit operands.
+define i64 @testSelectImm64(i64 %a, i64 %b) {
+entry:
+  %cond = select i1 1, i64 %a, i64 %b
+  ret i64 %cond
+}
+; CHECK-LABEL: testSelectImm64
+; CHECK-NOT: cmp {{[0-9]+}},
+
 ; ERRORS-NOT: ICE translation error
 ; DUMP-NOT: SZ