Build stack frames for stubs only when needed.

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 3353aabca395226a9a9a13245152be28400cf7f0..8f03f7bbb2b350e682751d47a9519910dd7c4ad0 100644
--- a/src/compiler/mips/code-generator-mips.cc
+++ b/src/compiler/mips/code-generator-mips.cc
@@ -913,6 +913,7 @@ void CodeGenerator::AssembleDeoptimizerCall(int deoptimization_id) {
 
 void CodeGenerator::AssemblePrologue() {
   CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
+  int stack_slots = frame()->GetSpillSlotCount();
   if (descriptor->kind() == CallDescriptor::kCallAddress) {
     __ Push(ra, fp);
     __ mov(fp, sp);
@@ -932,12 +933,11 @@ void CodeGenerator::AssemblePrologue() {
     __ Prologue(info->IsCodePreAgingActive());
     frame()->SetRegisterSaveAreaSize(
         StandardFrameConstants::kFixedFrameSizeFromFp);
-  } else {
+  } else if (stack_slots > 0) {
     __ StubPrologue();
     frame()->SetRegisterSaveAreaSize(
         StandardFrameConstants::kFixedFrameSizeFromFp);
   }
-  int stack_slots = frame()->GetSpillSlotCount();
 
   if (info()->is_osr()) {
     // TurboFan OSR-compiled functions cannot be entered directly.
@@ -961,10 +961,10 @@ void CodeGenerator::AssemblePrologue() {
 
 void CodeGenerator::AssembleReturn() {
   CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
+  int stack_slots = frame()->GetSpillSlotCount();
   if (descriptor->kind() == CallDescriptor::kCallAddress) {
     if (frame()->GetRegisterSaveAreaSize() > 0) {
       // Remove this frame's spill slots first.
-      int stack_slots = frame()->GetSpillSlotCount();
       if (stack_slots > 0) {
         __ Addu(sp, sp, Operand(stack_slots * kPointerSize));
       }
@@ -977,13 +977,15 @@ void CodeGenerator::AssembleReturn() {
     __ mov(sp, fp);
     __ Pop(ra, fp);
     __ Ret();
-  } else {
+  } else if (descriptor->IsJSFunctionCall() || stack_slots > 0) {
     __ mov(sp, fp);
     __ Pop(ra, fp);
     int pop_count = descriptor->IsJSFunctionCall()
                         ? static_cast<int>(descriptor->JSParameterCount())
                         : 0;
     __ DropAndRet(pop_count);
+  } else {
+    __ Ret();
   }
 }