Add popcnt support for pnacl

base/cpu.cc

Index: base/cpu.cc
diff --git a/base/cpu.cc b/base/cpu.cc
index de4a001f7f71210b0924688154431de45ee69b5f..af9c23da1a1ee2ceee74e48b729935032338472a 100644
--- a/base/cpu.cc
+++ b/base/cpu.cc
@@ -43,6 +43,7 @@ CPU::CPU()
     has_ssse3_(false),
     has_sse41_(false),
     has_sse42_(false),
+    has_popcnt_(false),
     has_avx_(false),
     has_avx2_(false),
     has_aesni_(false),
@@ -177,6 +178,8 @@ void CPU::Initialize() {
     has_ssse3_ = (cpu_info[2] & 0x00000200) != 0;
     has_sse41_ = (cpu_info[2] & 0x00080000) != 0;
     has_sse42_ = (cpu_info[2] & 0x00100000) != 0;
+    has_popcnt_ = (cpu_info[2] & 0x00800000) != 0;
+
     // AVX instructions will generate an illegal instruction exception unless
     //   a) they are supported by the CPU,
     //   b) XSAVE is supported by the CPU and