[turbofan] Add CalleeSavedFPRegisters to CallDescriptor.

src/compiler/mips64/code-generator-mips64.cc

Index: src/compiler/mips64/code-generator-mips64.cc
diff --git a/src/compiler/mips64/code-generator-mips64.cc b/src/compiler/mips64/code-generator-mips64.cc
index 5296ea82f7af01cb7ff304df99db54fba9017ab9..ed0d5c5bd64594063ee39f57fb1a3d17b6ee1c3e 100644
--- a/src/compiler/mips64/code-generator-mips64.cc
+++ b/src/compiler/mips64/code-generator-mips64.cc
@@ -1135,17 +1135,26 @@ void CodeGenerator::AssemblePrologue() {
   if (descriptor->kind() == CallDescriptor::kCallAddress) {
     __ Push(ra, fp);
     __ mov(fp, sp);
+    int register_save_area_size = 0;
     const RegList saves = descriptor->CalleeSavedRegisters();
     if (saves != 0) {  // Save callee-saved registers.
       // TODO(plind): make callee save size const, possibly DCHECK it.
-      int register_save_area_size = 0;
       for (int i = Register::kNumRegisters - 1; i >= 0; i--) {
         if (!((1 << i) & saves)) continue;
         register_save_area_size += kPointerSize;
       }
-      frame()->SetRegisterSaveAreaSize(register_save_area_size);
       __ MultiPush(saves);
     }
+    const RegList saves_fpu = descriptor->CalleeSavedFPURegisters();
+    if (saves_fpu != 0) {  // Save callee-saved FPU registers.
+      // TODO(plind): make callee save size const, possibly DCHECK it.
+      for (int i = FPURegister::kMaxNumRegisters - 1; i >= 0; i--) {
+        if (!((1 << i) & saves_fpu)) continue;
+        register_save_area_size += kPointerSize;
+      }
+      __ MultiPushFPU(saves_fpu);
+    }
+    frame()->SetRegisterSaveAreaSize(register_save_area_size);
   } else if (descriptor->IsJSFunctionCall()) {
     CompilationInfo* info = this->info();
     __ Prologue(info->IsCodePreAgingActive());
@@ -1188,7 +1197,12 @@ void CodeGenerator::AssembleReturn() {
       if (stack_slots > 0) {
         __ Daddu(sp, sp, Operand(stack_slots * kPointerSize));
       }
-      // Restore registers.
+      // Restore FPU registers.
+      const RegList saves_fpu = descriptor->CalleeSavedFPURegisters();
+      if (saves_fpu != 0) {
+        __ MultiPopFPU(saves_fpu);
+      }
+      // Restore GP registers.
       const RegList saves = descriptor->CalleeSavedRegisters();
       if (saves != 0) {
         __ MultiPop(saves);