Reland "Rename kIs64BitArch with kRequiresCodeRange."

src/spaces.cc

Index: src/spaces.cc
diff --git a/src/spaces.cc b/src/spaces.cc
index 7966a04728c6291e83142eeeda1acf2039c68c77..5be2d213bfdd3a3ff8ff05aa6d84ff27823c1278 100644
--- a/src/spaces.cc
+++ b/src/spaces.cc
@@ -115,15 +115,17 @@ bool CodeRange::SetUp(size_t requested) {
   ASSERT(code_range_ == NULL);
 
   if (requested == 0) {
-    // On 64-bit platform(s), we put all code objects in a 512 MB range of
-    // virtual address space, so that they can call each other with near calls.
-    if (kIs64BitArch) {
-      requested = 512 * MB;
+    // When a target requires the code range feature, we put all code objects
+    // in a kMaximalCodeRangeSize range of virtual address space, so that
+    // they can call each other with near calls.
+    if (kRequiresCodeRange) {
+      requested = kMaximalCodeRangeSize;
     } else {
       return true;
     }
   }
 
+  ASSERT(!kRequiresCodeRange || requested <= kMaximalCodeRangeSize);
   code_range_ = new VirtualMemory(requested);
   CHECK(code_range_ != NULL);
   if (!code_range_->IsReserved()) {