[turbofan] Support unboxed float and double stack parameters and add tests.

src/compiler/ia32/code-generator-ia32.cc

Index: src/compiler/ia32/code-generator-ia32.cc
diff --git a/src/compiler/ia32/code-generator-ia32.cc b/src/compiler/ia32/code-generator-ia32.cc
index 593bf9545afcfc4750b6dec147e1baa9a267aa6f..27033d66e051e899022baa6ba02fcb30fa7f8d8a 100644
--- a/src/compiler/ia32/code-generator-ia32.cc
+++ b/src/compiler/ia32/code-generator-ia32.cc
@@ -875,7 +875,10 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       break;
     }
     case kIA32Push:
-      if (HasImmediateInput(instr, 0)) {
+      if (instr->InputAt(0)->IsDoubleRegister()) {
+        __ sub(esp, Immediate(kDoubleSize));
+        __ movsd(Operand(esp, 0), i.InputDoubleRegister(0));
+      } else if (HasImmediateInput(instr, 0)) {
         __ push(i.InputImmediate(0));
       } else {
         __ push(i.InputOperand(0));