MIPS64: Eliminate ABI-dependent definitions.

src/mips64/deoptimizer-mips64.cc

Index: src/mips64/deoptimizer-mips64.cc
diff --git a/src/mips64/deoptimizer-mips64.cc b/src/mips64/deoptimizer-mips64.cc
index 61bdca69591714b54c7dc6da4a943c66334b29b3..a62817a8674590470a6858799deccb9d1ba20e80 100644
--- a/src/mips64/deoptimizer-mips64.cc
+++ b/src/mips64/deoptimizer-mips64.cc
@@ -188,15 +188,9 @@ void Deoptimizer::TableEntryGenerator::Generate() {
   __ ld(a0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
   // a2: bailout id already loaded.
   // a3: code address or 0 already loaded.
-  if (kMipsAbi == kN64) {
-    // a4: already has fp-to-sp delta.
-    __ li(a5, Operand(ExternalReference::isolate_address(isolate())));
-  } else {  // O32 abi.
-    // Pass four arguments in a0 to a3 and fifth & sixth arguments on stack.
-    __ sd(a4, CFunctionArgumentOperand(5));  // Fp-to-sp delta.
-    __ li(a5, Operand(ExternalReference::isolate_address(isolate())));
-    __ sd(a5, CFunctionArgumentOperand(6));  // Isolate.
-  }
+  // a4: already has fp-to-sp delta.
+  __ li(a5, Operand(ExternalReference::isolate_address(isolate())));
+
   // Call Deoptimizer::New().
   {
     AllowExternalCallThatCantCauseGC scope(masm());