Update the tcmalloc vendor branch to r144 (gperftools 2.0).

third_party/tcmalloc/vendor/src/base/cycleclock.h

Index: third_party/tcmalloc/vendor/src/base/cycleclock.h
diff --git a/third_party/tcmalloc/vendor/src/base/cycleclock.h b/third_party/tcmalloc/vendor/src/base/cycleclock.h
index db5f49a1bb4b2996057bd1476e7288c211229dbb..c704e1dae645f7b5827fd21392613436314b7edc 100644
--- a/third_party/tcmalloc/vendor/src/base/cycleclock.h
+++ b/third_party/tcmalloc/vendor/src/base/cycleclock.h
@@ -47,6 +47,11 @@
 
 #include "base/basictypes.h"   // make sure we get the def for int64
 #include "base/arm_instruction_set_select.h"
+// base/sysinfo.h is really big and we don't want to include it unless
+// it is necessary.
+#if defined(__arm__) || defined(__mips__)
+# include "base/sysinfo.h"
+#endif
 #if defined(__MACH__) && defined(__APPLE__)
 # include <mach/mach_time.h>
 #endif
@@ -61,7 +66,7 @@
 extern "C" uint64 __rdtsc();
 #pragma intrinsic(__rdtsc)
 #endif
-#ifdef ARMV3
+#if defined(ARMV3) || defined(__mips__)
 #include <sys/time.h>
 #endif
 
@@ -124,11 +129,11 @@ struct CycleClock {
     uint32 pmuseren;
     uint32 pmcntenset;
     // Read the user mode perf monitor counter access permissions.
-    asm("mrc p15, 0, %0, c9, c14, 0" : "=r" (pmuseren));
+    asm volatile ("mrc p15, 0, %0, c9, c14, 0" : "=r" (pmuseren));
     if (pmuseren & 1) {  // Allows reading perfmon counters for user mode code.
-      asm("mrc p15, 0, %0, c9, c12, 1" : "=r" (pmcntenset));
+      asm volatile ("mrc p15, 0, %0, c9, c12, 1" : "=r" (pmcntenset));
       if (pmcntenset & 0x80000000ul) {  // Is it counting?
-        asm("mrc p15, 0, %0, c9, c13, 0" : "=r" (pmccntr));
+        asm volatile ("mrc p15, 0, %0, c9, c13, 0" : "=r" (pmccntr));
         // The counter is set up to count every 64th cycle
         return static_cast<int64>(pmccntr) * 64;  // Should optimize to << 6
       }
@@ -136,7 +141,15 @@ struct CycleClock {
 #endif
     struct timeval tv;
     gettimeofday(&tv, NULL);
-    return static_cast<int64>(tv.tv_sec) * 1000000 + tv.tv_usec;
+    return static_cast<int64>((tv.tv_sec + tv.tv_usec * 0.000001)
+                              * CyclesPerSecond());
+#elif defined(__mips__)
+    // mips apparently only allows rdtsc for superusers, so we fall
+    // back to gettimeofday.  It's possible clock_gettime would be better.
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    return static_cast<int64>((tv.tv_sec + tv.tv_usec * 0.000001)
+                              * CyclesPerSecond());
 #else
 // The soft failover to a generic implementation is automatic only for ARM.
 // For other platforms the developer is expected to make an attempt to create