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

Port 817b59c8

Adds instructions for MIPS to push float (single) and double registers.

LOG=N
BUG=v8:4124
TEST=cctest/test-run-native-calls/Float32Select_stack_params_return_reg,
cctest/test-run-native-calls/MixedParams_0, cctest/test-run-native-calls/MixedParams_1,
cctest/test-run-native-calls/MixedParams_2, cctest/test-run-native-calls/MixedParams_3

Review-Url: https://codereview.chromium.org/2038813002
Cr-Commit-Position: refs/heads/master@{#36719}

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

@@ -1307,7 +1307,13 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     }
     case kMipsStoreToStackSlot: {
       if (instr->InputAt(0)->IsFPRegister()) {
-        __ sdc1(i.InputDoubleRegister(0), MemOperand(sp, i.InputInt32(1)));
+        LocationOperand* op = LocationOperand::cast(instr->InputAt(0));
+        if (op->representation() == MachineRepresentation::kFloat64) {
+          __ sdc1(i.InputDoubleRegister(0), MemOperand(sp, i.InputInt32(1)));
+        } else {
+          DCHECK_EQ(MachineRepresentation::kFloat32, op->representation());
+          __ swc1(i.InputSingleRegister(0), MemOperand(sp, i.InputInt32(1)));
+        }
       } else {
         __ sw(i.InputRegister(0), MemOperand(sp, i.InputInt32(1)));
       }