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

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

Index: src/compiler/mips/code-generator-mips.cc
diff --git a/src/compiler/mips/code-generator-mips.cc b/src/compiler/mips/code-generator-mips.cc
index fd6885b7555aa26ed6ca18573d730f5a5480f864..0c5ff85d2de1211973d07100a21d5d4d1bb7306b 100644
--- a/src/compiler/mips/code-generator-mips.cc
+++ b/src/compiler/mips/code-generator-mips.cc
@@ -790,14 +790,23 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       __ sdc1(i.InputDoubleRegister(2), i.MemoryOperand());
       break;
     case kMipsPush:
-      __ Push(i.InputRegister(0));
+      if (instr->InputAt(0)->IsDoubleRegister()) {
+        __ sdc1(i.InputDoubleRegister(0), MemOperand(sp, -kDoubleSize));
+        __ Subu(sp, sp, Operand(kDoubleSize));
+      } else {
+        __ Push(i.InputRegister(0));
+      }
       break;
     case kMipsStackClaim: {
       __ Subu(sp, sp, Operand(i.InputInt32(0)));
       break;
     }
     case kMipsStoreToStackSlot: {
-      __ sw(i.InputRegister(0), MemOperand(sp, i.InputInt32(1)));
+      if (instr->InputAt(0)->IsDoubleRegister()) {
+        __ sdc1(i.InputDoubleRegister(0), MemOperand(sp, i.InputInt32(1)));
+      } else {
+        __ sw(i.InputRegister(0), MemOperand(sp, i.InputInt32(1)));
+      }
       break;
     }
     case kMipsStoreWriteBarrier: {