Optimize out memory and table when possible (#1352)

We can remove the memory/table (itself, or an import if imported) if they are not used. This is pretty minor on a large wasm file, but when reading small wasts it's very noticeable to have an unused memory and table all the time.

1 files changed, 3 insertions, 4 deletions

diff --git a/test/emcc_O2_hello_world.fromasm.clamp b/test/emcc_O2_hello_world.fromasm.clamp
index aa1a08dc6..0bc4edf68 100644
--- a/test/emcc_O2_hello_world.fromasm.clamp
+++ b/test/emcc_O2_hello_world.fromasm.clamp
@@ -6,6 +6,9 @@
  (type $FUNCSIG$iii (func (param i32 i32) (result i32)))
  (type $FUNCSIG$v (func))
  (type $FUNCSIG$vii (func (param i32 i32)))
+ (import "env" "memory" (memory $0 256 256))
+ (import "env" "table" (table 18 18 anyfunc))
+ (import "env" "tableBase" (global $tableBase i32))
  (import "env" "STACKTOP" (global $STACKTOP$asm2wasm$import i32))
  (import "env" "STACK_MAX" (global $STACK_MAX$asm2wasm$import i32))
  (import "env" "abort" (func $abort (param i32)))
@@ -23,10 +26,6 @@
  (import "env" "___unlock" (func $___unlock (param i32)))
  (import "env" "___syscall140" (func $___syscall140 (param i32 i32) (result i32)))
  (import "env" "___syscall146" (func $___syscall146 (param i32 i32) (result i32)))
- (import "env" "memory" (memory $0 256 256))
- (import "env" "table" (table 18 18 anyfunc))
- (import "env" "memoryBase" (global $memoryBase i32))
- (import "env" "tableBase" (global $tableBase i32))
  (global $STACKTOP (mut i32) (get_global $STACKTOP$asm2wasm$import))
  (global $STACK_MAX (mut i32) (get_global $STACK_MAX$asm2wasm$import))
  (global $__THREW__ (mut i32) (i32.const 0))