Subzero: Fix x86 floating-point constant emission

tests_lit/llvm2ice_tests/fpconst.pnacl.ll

Index: tests_lit/llvm2ice_tests/fpconst.pnacl.ll
diff --git a/tests_lit/llvm2ice_tests/fpconst.pnacl.ll b/tests_lit/llvm2ice_tests/fpconst.pnacl.ll
index 6ca41e44083c7ccb3ec9c9637b8b315e55fffae5..b9d4e58ba1c07289d7d4e6ec0f5116b20e0470ce 100644
--- a/tests_lit/llvm2ice_tests/fpconst.pnacl.ll
+++ b/tests_lit/llvm2ice_tests/fpconst.pnacl.ll
@@ -6,6 +6,7 @@
 ; number in a reasonable number of digits".  See
 ; http://llvm.org/docs/LangRef.html#simple-constants .
 
+; RUN: %llvm2ice -Om1 --verbose none %s | FileCheck %s
 ; RUN: %llvm2ice --verbose none %s | FileCheck --check-prefix=ERRORS %s
 ; RUN: %llvm2iceinsts %s | %szdiff %s | FileCheck --check-prefix=DUMP %s
 ; RUN: %llvm2iceinsts --pnacl %s | %szdiff %s \
@@ -534,5 +535,16 @@ return:                                           ; preds = %entry, %sw.bb65, %s
   ret double %retval.0
 }
 
+; The FP constant pool entries for each type are dumped in some
+; implementation-dependent order.  So for the purposes of lit, we just
+; pick one value for each type, and make sure it appears exactly once.
+
+; Check for float 0.5
+; CHECK:     .long   1056964608
+; CHECK-NOT: .long   1056964608
+; Check for double 0.5
+; CHECK:     .quad   4602678819172646912
+; CHECK-NOT: .quad   4602678819172646912
+
 ; ERRORS-NOT: ICE translation error
 ; DUMP-NOT: SZ