The ".testctrl optimizations 0x400000" command disables the generation of

OP_ReleaseReg opcodes.  OP_ReleaseReg opcodes are usually only generated for
SQLITE_DEBUG builds and are used to verify that registers are descoped
propertly.  But they can get in the way of code understanding when studying
bytecode dumps.  So this new optimization setting is provided to
temporarily turn OP_ReleaseReg opcodes off.

FossilOrigin-Name: fa5276725f246cef9d58b27c1e617ee3f873f7a9b88284a4e8fc453ebda338bc

src/sqliteInt.h

@@ -1779,6 +1779,7 @@ struct sqlite3 {
 #define SQLITE_BloomFilter    0x00080000 /* Use a Bloom filter on searches */
 #define SQLITE_BloomPulldown  0x00100000 /* Run Bloom filters early */
 #define SQLITE_BalancedMerge  0x00200000 /* Balance multi-way merges */
+#define SQLITE_ReleaseReg     0x00400000 /* Use OP_ReleaseReg for testing */
 #define SQLITE_AllOpts        0xffffffff /* All optimizations */
 
 /*