Add missing cpu.h includes to mips/x87

BUG=none
TBR=yangguo@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/358073005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22101 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/assembler-mips.cc

@@ -37,6 +37,7 @@
 
 #if V8_TARGET_ARCH_MIPS
 
+#include "src/base/cpu.h"
 #include "src/mips/assembler-mips-inl.h"
 #include "src/serialize.h"
 

src/x87/assembler-x87.cc

@@ -38,6 +38,7 @@
 
 #if V8_TARGET_ARCH_X87
 
+#include "src/base/cpu.h"
 #include "src/disassembler.h"
 #include "src/macro-assembler.h"
 #include "src/serialize.h"