Update sqlite to 3.7.3.

third_party/sqlite/src/src/mem5.c

Index: third_party/sqlite/src/src/mem5.c
diff --git a/third_party/sqlite/src/src/mem5.c b/third_party/sqlite/src/src/mem5.c
index 3fe04e24552cd4d5724e7398d9547fc1fe7a218f..2fdfac141358a359b33a245576f8f70b10533132 100644
--- a/third_party/sqlite/src/src/mem5.c
+++ b/third_party/sqlite/src/src/mem5.c
@@ -268,7 +268,11 @@ static void *memsys5MallocUnsafe(int nByte){
   ** two in order to create a new free block of size iLogsize.
   */
   for(iBin=iLogsize; mem5.aiFreelist[iBin]<0 && iBin<=LOGMAX; iBin++){}
-  if( iBin>LOGMAX ) return 0;
+  if( iBin>LOGMAX ){
+    testcase( sqlite3GlobalConfig.xLog!=0 );
+    sqlite3_log(SQLITE_NOMEM, "failed to allocate %u bytes", nByte);
+    return 0;
+  }
   i = memsys5UnlinkFirst(iBin);
   while( iBin>iLogsize ){
     int newSize;
@@ -391,7 +395,7 @@ static void *memsys5Realloc(void *pPrior, int nBytes){
   int nOld;
   void *p;
   assert( pPrior!=0 );
-  assert( (nBytes&(nBytes-1))==0 );
+  assert( (nBytes&(nBytes-1))==0 );  /* EV: R-46199-30249 */
   assert( nBytes>=0 );
   if( nBytes==0 ){
     return 0;