Backout commit 289e653a7061 for bug 995704 - potential perf regression.

js/src/jit/CodeGenerator.cpp

@@ -2805,19 +2805,7 @@ CodeGenerator::generateArgumentsChecks(bool bailout)
     // Reserve the amount of stack the actual frame will use. We have to undo
     // this before falling through to the method proper though, because the
     // monomorphic call case will bypass this entire path.
-
-    // On windows, we cannot skip very far down the stack without touching the
-    // memory pages in-between.  This is a corner-case code for situations where the
-    // Ion frame data for a piece of code is very large.  To handle this special case,
-    // for frames over 1k in size we allocate memory on the stack incrementally, touching
-    // it as we go.
-    uint32_t frameSizeLeft = frameSize();
-    while (frameSizeLeft > 1024) {
-        masm.reserveStack(1024);
-        masm.store32(Imm32(0), Address(StackPointer, 0));
-        frameSizeLeft -= 1024;
-    }
-    masm.reserveStack(frameSizeLeft);
+    masm.reserveStack(frameSize());
 
     // No registers are allocated yet, so it's safe to grab anything.
     Register temp = GeneralRegisterSet(EntryTempMask).getAny();