Turbofan: Modify WASM linkage to store floats using only 4 bytes.

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 c3964e7f4d6fb6b8802993f67e25f349ad552511..ef7eaaf39e8b1f16704073548b8410636b8c39d8 100644
--- a/src/compiler/ia32/code-generator-ia32.cc
+++ b/src/compiler/ia32/code-generator-ia32.cc
@@ -1230,9 +1230,9 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     }
     case kIA32PushFloat32:
       if (instr->InputAt(0)->IsFPRegister()) {
-        __ sub(esp, Immediate(kDoubleSize));
+        __ sub(esp, Immediate(kFloatSize));
         __ movss(Operand(esp, 0), i.InputDoubleRegister(0));
-        frame_access_state()->IncreaseSPDelta(kDoubleSize / kPointerSize);
+        frame_access_state()->IncreaseSPDelta(kFloatSize / kPointerSize);
       } else if (HasImmediateInput(instr, 0)) {
         __ Move(kScratchDoubleReg, i.InputDouble(0));
         __ sub(esp, Immediate(kDoubleSize));
@@ -1264,9 +1264,9 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       break;
     case kIA32Push:
       if (instr->InputAt(0)->IsFPRegister()) {
-        __ sub(esp, Immediate(kDoubleSize));
+        __ sub(esp, Immediate(kFloatSize));
         __ movsd(Operand(esp, 0), i.InputDoubleRegister(0));
-        frame_access_state()->IncreaseSPDelta(kDoubleSize / kPointerSize);
+        frame_access_state()->IncreaseSPDelta(kFloatSize / kPointerSize);
       } else if (HasImmediateInput(instr, 0)) {
         __ push(i.InputImmediate(0));
         frame_access_state()->IncreaseSPDelta(1);