Reland PPC portion of "Detect cache line size on Linux for PPC hosts."

src/assembler.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 206 matching lines @@
     Probe(false);
     return supported_;
   }
 
   static bool IsSupported(CpuFeature f) {
     return (supported_ & (1u << f)) != 0;
   }
 
   static inline bool SupportsCrankshaft();
 
-  static inline unsigned cache_line_size() {
-    DCHECK(cache_line_size_ != 0);
-    return cache_line_size_;
+  static inline unsigned icache_line_size() {
+    DCHECK(icache_line_size_ != 0);
+    return icache_line_size_;
+  }
+
+  static inline unsigned dcache_line_size() {
+    DCHECK(dcache_line_size_ != 0);
+    return dcache_line_size_;
   }
 
   static void PrintTarget();
   static void PrintFeatures();
 
  private:
   friend class ExternalReference;
   friend class AssemblerBase;
   // Flush instruction cache.
   static void FlushICache(void* start, size_t size);
 
   // Platform-dependent implementation.
   static void ProbeImpl(bool cross_compile);
 
   static unsigned supported_;
-  static unsigned cache_line_size_;
+  static unsigned icache_line_size_;
+  static unsigned dcache_line_size_;
   static bool initialized_;
   DISALLOW_COPY_AND_ASSIGN(CpuFeatures);
 };
 
 
 // -----------------------------------------------------------------------------
 // Labels represent pc locations; they are typically jump or call targets.
 // After declaration, a label can be freely used to denote known or (yet)
 // unknown pc location. Assembler::bind() is used to bind a label to the
 // current pc. A label can be bound only once.
@@ skipping 1043 matching lines @@
     std::vector<ConstantPoolEntry> shared_entries;
   };
 
   Label emitted_label_;  // Records pc_offset of emitted pool
   PerTypeEntryInfo info_[ConstantPoolEntry::NUMBER_OF_TYPES];
 };
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_ASSEMBLER_H_