Move platform abstraction to base library

src/ia32/assembler-ia32.cc

Index: src/ia32/assembler-ia32.cc
diff --git a/src/ia32/assembler-ia32.cc b/src/ia32/assembler-ia32.cc
index 75cb6ed7c4cba1c034dfc79c7fb7aa650bb629c4..6497ba6db0a980e8af1c3b0153ea18a84b18db9d 100644
--- a/src/ia32/assembler-ia32.cc
+++ b/src/ia32/assembler-ia32.cc
@@ -38,6 +38,7 @@
 
 #if V8_TARGET_ARCH_IA32
 
+#include "src/base/cpu.h"
 #include "src/disassembler.h"
 #include "src/macro-assembler.h"
 #include "src/serialize.h"
@@ -49,7 +50,7 @@ namespace internal {
 // Implementation of CpuFeatures
 
 void CpuFeatures::ProbeImpl(bool cross_compile) {
-  CPU cpu;
+  base::CPU cpu;
   CHECK(cpu.has_sse2());  // SSE2 support is mandatory.
   CHECK(cpu.has_cmov());  // CMOV support is mandatory.
 
@@ -112,7 +113,7 @@ void RelocInfo::PatchCode(byte* instructions, int instruction_count) {
   }
 
   // Indicate that code has changed.
-  CPU::FlushICache(pc_, instruction_count);
+  CpuFeatures::FlushICache(pc_, instruction_count);
 }