PPC: Refine "[runtime] [proxy] removing JSFunctionProxy and related code."

R=cbruni@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:1543
LOG=N

Review URL: https://codereview.chromium.org/1500993003

Cr-Commit-Position: refs/heads/master@{#32626}

src/ppc/builtins-ppc.cc

@@ -1698,7 +1698,7 @@ void Builtins::Generate_Call(MacroAssembler* masm, ConvertReceiverMode mode) {
   __ cmpi(r8, Operand(JS_PROXY_TYPE));
   __ bne(&non_function);
 
-  // 1. Call to function proxy.
+  // 1. Call to proxy.
   // TODO(neis): Implement [[Call]] on proxies.
 
   // 2. Call to something else, which might have a [[Call]] internal method (if