Convert Linkage to use MachineSignature.

src/compiler/arm64/code-generator-arm64.cc

Index: src/compiler/arm64/code-generator-arm64.cc
diff --git a/src/compiler/arm64/code-generator-arm64.cc b/src/compiler/arm64/code-generator-arm64.cc
index 1fb7c65686b638eea9174ffa1150e572ab7b957b..dfe3633143d90fed468b87732220c297cd06892f 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -149,9 +149,15 @@ 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.
+        UseScratchRegisterScope scope(masm());
+        Register temp = scope.AcquireX();
+        __ Ldr(temp, FieldMemOperand(func, JSFunction::kContextOffset));
+        __ cmp(cp, temp);
+        __ Assert(eq, kWrongFunctionContext);
+      }
       __ Ldr(x10, FieldMemOperand(func, JSFunction::kCodeEntryOffset));
       __ Call(x10);
       AddSafepointAndDeopt(instr);
@@ -702,7 +708,7 @@ void CodeGenerator::AssembleReturn() {
     __ Mov(jssp, fp);
     __ Pop(fp, lr);
     int pop_count =
-        descriptor->IsJSFunctionCall() ? descriptor->ParameterCount() : 0;
+        descriptor->IsJSFunctionCall() ? descriptor->JSParamCount() : 0;
     __ Drop(pop_count);
     __ Ret();
   }