[sql] Import reference version of SQLite 3.8.7.4.

third_party/sqlite/sqlite-src-3080704/src/bitvec.c

Index: third_party/sqlite/sqlite-src-3080704/src/bitvec.c
diff --git a/third_party/sqlite/src/src/bitvec.c b/third_party/sqlite/sqlite-src-3080704/src/bitvec.c
similarity index 99%
copy from third_party/sqlite/src/src/bitvec.c
copy to third_party/sqlite/sqlite-src-3080704/src/bitvec.c
index 47d33ea840833e575464c853f501e7c60ef1bde6..52184aa964ce1898f35d1b3d87871c2d0ef4c53d 100644
--- a/third_party/sqlite/src/src/bitvec.c
+++ b/third_party/sqlite/sqlite-src-3080704/src/bitvec.c
@@ -72,7 +72,7 @@
 /*
 ** A bitmap is an instance of the following structure.
 **
-** This bitmap records the existance of zero or more bits
+** This bitmap records the existence of zero or more bits
 ** with values between 1 and iSize, inclusive.
 **
 ** There are three possible representations of the bitmap.
@@ -340,10 +340,9 @@ int sqlite3BitvecBuiltinTest(int sz, int *aOp){
   /* Allocate the Bitvec to be tested and a linear array of
   ** bits to act as the reference */
   pBitvec = sqlite3BitvecCreate( sz );
-  pV = sqlite3_malloc( (sz+7)/8 + 1 );
+  pV = sqlite3MallocZero( (sz+7)/8 + 1 );
   pTmpSpace = sqlite3_malloc(BITVEC_SZ);
   if( pBitvec==0 || pV==0 || pTmpSpace==0  ) goto bitvec_end;
-  memset(pV, 0, (sz+7)/8 + 1);
 
   /* NULL pBitvec tests */
   sqlite3BitvecSet(0, 1);