MIPS: [runtime] Unify and simplify how frames are marked.

src/mips/deoptimizer-mips.cc

Index: src/mips/deoptimizer-mips.cc
diff --git a/src/mips/deoptimizer-mips.cc b/src/mips/deoptimizer-mips.cc
index 0caaa4c9d4f82033ad4b42b730261612633e3a79..090e52c4aebe81dc12b5f8bbda943f54fd2fd37b 100644
--- a/src/mips/deoptimizer-mips.cc
+++ b/src/mips/deoptimizer-mips.cc
@@ -160,10 +160,15 @@ void Deoptimizer::TableEntryGenerator::Generate() {
   __ Subu(t0, fp, t0);
 
   // Allocate a new deoptimizer object.
-  // Pass four arguments in a0 to a3 and fifth & sixth arguments on stack.
   __ PrepareCallCFunction(6, t1);
+  // Pass four arguments in a0 to a3 and fifth & sixth arguments on stack.
+  __ mov(a0, zero_reg);
+  Label context_check;
+  __ lw(a1, MemOperand(fp, CommonFrameConstants::kContextOrFrameTypeOffset));
+  __ JumpIfSmi(a1, &context_check);
   __ lw(a0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
-  __ li(a1, Operand(type()));  // bailout type,
+  __ bind(&context_check);
+  __ li(a1, Operand(type()));  // Bailout type.
   // a2: bailout id already loaded.
   // a3: code address or 0 already loaded.
   __ sw(t0, CFunctionArgumentOperand(5));  // Fp-to-sp delta.