[turbofan] Elide fp32 convert for const compares

src/compiler/arm/code-generator-arm.cc

Index: src/compiler/arm/code-generator-arm.cc
diff --git a/src/compiler/arm/code-generator-arm.cc b/src/compiler/arm/code-generator-arm.cc
index 6cb32f421ba020ff9bebdd6b3b59788482fc7514..bef65577fd1f6365df304d2a01d3f600b7f03733 100644
--- a/src/compiler/arm/code-generator-arm.cc
+++ b/src/compiler/arm/code-generator-arm.cc
@@ -572,8 +572,8 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       } else {
         DCHECK(instr->InputAt(1)->IsImmediate());
         // 0.0 is the only immediate supported by vcmp instructions.
-        DCHECK(i.InputDouble(1) == 0.0);
-        __ VFPCompareAndSetFlags(i.InputFloat32Register(0), i.InputDouble(1));
+        DCHECK(i.InputFloat32(1) == 0.0f);
+        __ VFPCompareAndSetFlags(i.InputFloat32Register(0), i.InputFloat32(1));
       }
       DCHECK_EQ(SetCC, i.OutputSBit());
       break;