Convert Linkage to use MachineSignature.

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

Index: src/compiler/arm/code-generator-arm.cc
diff --git a/src/compiler/arm/code-generator-arm.cc b/src/compiler/arm/code-generator-arm.cc
index bc11f5a7b5c72f056fe6906b75a988dc6ef298a3..0bb0aaa0cc24e774a5826a494119fb1f063fef36 100644
--- a/src/compiler/arm/code-generator-arm.cc
+++ b/src/compiler/arm/code-generator-arm.cc
@@ -156,9 +156,13 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       break;
     }
     case kArchCallJSFunction: {
-      // TODO(jarin) The load of the context should be separated from the call.
       Register func = i.InputRegister(0);
-      __ ldr(cp, FieldMemOperand(func, JSFunction::kContextOffset));
+      if (FLAG_debug_code) {
+        // Check the function's context matches the context argument.
+        __ ldr(kScratchReg, FieldMemOperand(func, JSFunction::kContextOffset));
+        __ cmp(cp, kScratchReg);
+        __ Assert(eq, kWrongFunctionContext);
+      }
       __ ldr(ip, FieldMemOperand(func, JSFunction::kCodeEntryOffset));
       __ Call(ip);
       AddSafepointAndDeopt(instr);
@@ -682,7 +686,7 @@ void CodeGenerator::AssembleReturn() {
   } else {
     __ LeaveFrame(StackFrame::MANUAL);
     int pop_count =
-        descriptor->IsJSFunctionCall() ? descriptor->ParameterCount() : 0;
+        descriptor->IsJSFunctionCall() ? descriptor->JSParamCount() : 0;
     __ Drop(pop_count);
     __ Ret();
   }