Revert 8133: Lower heap size limits on systems that are short of virtual memory.

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 8209)
+++ src/heap.cc	(working copy)
@@ -153,29 +153,6 @@
   max_semispace_size_ = reserved_semispace_size_ = V8_MAX_SEMISPACE_SIZE;
 #endif
 
-  intptr_t max_virtual = OS::MaxVirtualMemory();
-
-  if (max_virtual > 0) {
-    intptr_t half = max_virtual >> 1;
-    intptr_t quarter = max_virtual >> 2;
-    // If we have limits on the amount of virtual memory we can use then we may
-    // be forced to lower the allocation limits.  We reserve one quarter of the
-    // memory for young space and off-heap data.  The rest is distributed as
-    // described below.
-    if (code_range_size_ > 0) {
-      // Reserve a quarter of the memory for the code range.  The old space
-      // heap gets the remaining half.  There is some unavoidable double
-      // counting going on here since the heap size is measured in committed
-      // virtual memory and the code range is only reserved virtual memory.
-      code_range_size_ = Min(code_range_size_, quarter);
-      max_old_generation_size_ = Min(max_old_generation_size_, half);
-    } else {
-      // Reserve three quarters of the memory for the old space heap including
-      // the executable code.
-      max_old_generation_size_ = Min(max_old_generation_size_, half + quarter);
-    }
-  }
-
   memset(roots_, 0, sizeof(roots_[0]) * kRootListLength);
   global_contexts_list_ = NULL;
   mark_compact_collector_.heap_ = this;