Really fix the build

runtime/vm/profiler.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/utils.h"
 
 #include "vm/allocation.h"
 #include "vm/atomic.h"
 #include "vm/code_patcher.h"
 #include "vm/isolate.h"
@@ skipping 1734 matching lines @@
 
   void walk(Heap* heap) {
     const uword kMaxStep = VirtualMemory::PageSize();
 
     sample_->SetAt(0, original_pc_);
 
     uword* pc = reinterpret_cast<uword*>(original_pc_);
     uword* fp = reinterpret_cast<uword*>(original_fp_);
     uword* previous_fp = fp;
 
-    if ((original_fp_ - original_sp_) >= kMaxStep) {
+    uword gap = original_fp_ - original_sp_;
+    if (gap >= kMaxStep) {
       // Gap between frame pointer and stack pointer is
       // too large.
       return;
     }
 
     if (!ValidFramePointer(fp)) {
       return;
     }
 
     for (int i = 0; i < FLAG_profile_depth; i++) {
       sample_->SetAt(i, reinterpret_cast<uword>(pc));
 
       pc = CallerPC(fp);
       previous_fp = fp;
       fp = CallerFP(fp);
 
       if (fp == NULL) {
         return;
       }
 
       if (fp <= previous_fp) {
         // Frame pointer did not move to a higher address.
         return;
       }
 
-      if ((fp - previous_fp) >= kMaxStep) {
+      gap = fp - previous_fp;
+      if (gap >= kMaxStep) {
         // Frame pointer step is too large.
         return;
       }
 
       if (!ValidFramePointer(fp)) {
         // Frame pointer is outside of isolate stack boundary.
         return;
       }
 
       // Move the lower bound up.
@@ skipping 134 matching lines @@
       stackWalker.walk();
     } else {
       ProfilerNativeStackWalker stackWalker(sample, stack_lower, stack_upper,
                                             state.pc, state.fp, state.sp);
       stackWalker.walk(isolate->heap());
     }
   }
 }
 
 }  // namespace dart