Contribution of PowerPC port.

src/base/cpu.h

Index: src/base/cpu.h
diff --git a/src/base/cpu.h b/src/base/cpu.h
index d61844c151891ca8f6275c0fd882f2b2af373b6f..2098a2dd5054a2f9ec9db3e9c584175775f1a529 100644
--- a/src/base/cpu.h
+++ b/src/base/cpu.h
@@ -55,6 +55,18 @@ class CPU V8_FINAL {
   static const int ARM_CORTEX_A12 = 0xc0c;
   static const int ARM_CORTEX_A15 = 0xc0f;
 
+  // PPC-specific part codes
+  int cache_line_size() const { return cache_line_size_; }
+  enum {
+    PPC_POWER5,
+    PPC_POWER6,
+    PPC_POWER7,
+    PPC_POWER8,
+    PPC_G4,
+    PPC_G5,
+    PPC_PA6T
+  };
+
   // General features
   bool has_fpu() const { return has_fpu_; }
 
@@ -91,6 +103,7 @@ class CPU V8_FINAL {
   int implementer_;
   int architecture_;
   int part_;
+  int cache_line_size_;
   bool has_fpu_;
   bool has_cmov_;
   bool has_sahf_;