[sql] Import SQLite 3.17.0.

third_party/sqlite/src/src/hwtime.h

 /*
 ** 2008 May 27
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
 ******************************************************************************
 **
 ** This file contains inline asm code for retrieving "high-performance"
 ** counters for x86 class CPUs.
 */
-#ifndef _HWTIME_H_
-#define _HWTIME_H_
+#ifndef SQLITE_HWTIME_H
+#define SQLITE_HWTIME_H
 
 /*
 ** The following routine only works on pentium-class (or newer) processors.
 ** It uses the RDTSC opcode to read the cycle count value out of the
 ** processor and returns that value.  This can be used for high-res
 ** profiling.
 */
 #if (defined(__GNUC__) || defined(_MSC_VER)) && \
       (defined(i386) || defined(__i386__) || defined(_M_IX86))
 
@@ skipping 47 matching lines @@
   ** To compile without implementing sqlite3Hwtime() for your platform,
   ** you can remove the above #error and use the following
   ** stub function.  You will lose timing support for many
   ** of the debugging and testing utilities, but it should at
   ** least compile and run.
   */
   sqlite_uint64 sqlite3Hwtime(void){ return ((sqlite_uint64)0); }
 
 #endif
 
-#endif /* !defined(_HWTIME_H_) */
+#endif /* !defined(SQLITE_HWTIME_H) */