fix memory issue with long sql strings

fixes #561

thanks @kripken for the fix: #561 (comment)

Author: lovasoa

Makefile

@@ -48,15 +48,16 @@ EMFLAGS_ASM_MEMORY_GROWTH = \
 
 EMFLAGS_WASM = \
 	-s WASM=1 \
-	-s ALLOW_MEMORY_GROWTH=1
+	-s ALLOW_MEMORY_GROWTH=1 \
+	-s STACK_SIZE=5MB
 
 EMFLAGS_OPTIMIZED= \
 	-Oz \
 	-flto \
 	--closure 1
 
 EMFLAGS_DEBUG = \
-	-s ASSERTIONS=1 \
+	-s ASSERTIONS=2 \
 	-O1
 
 BITCODE_FILES = out/sqlite3.bc out/extension-functions.bc