wasm2c: run multi-memory tests

This runs and passes 5 of the 9 multi-memory tests (although
one of them, binary.wast, is a nop for wasm2c itself).

The other 4 tests would require reference types or bulk memory:

	imports.wast
	load.wast
	memory-multi.wast
	store.wast

src/tools/wasm2c.cc

@@ -94,6 +94,7 @@ static void ParseOptions(int argc, char** argv) {
     exit(1);
   }
   s_features.disable_bulk_memory();
+  s_features.enable_multi_memory();
 }
 
 // TODO(binji): copied from binary-writer-spec.cc, probably should share.

test/run-spec-wasm2c.py

@@ -386,6 +386,7 @@ def main(args):
             error_cmdline=options.error_cmdline)
         wast2json.verbose = options.print_cmd
         wast2json.AppendOptionalArgs({'-v': options.verbose})
+        wast2json.AppendArg('--enable-multi-memory')
 
         json_file_path = utils.ChangeDir(
             utils.ChangeExt(options.file, '.json'), out_dir)

test/wasm2c/spec/multi-memory/binary.txt

@@ -0,0 +1,5 @@
+;;; TOOL: run-spec-wasm2c
+;;; STDIN_FILE: third_party/testsuite/proposals/multi-memory/binary.wast
+(;; STDOUT ;;;
+0/0 tests passed.
+;;; STDOUT ;;)

test/wasm2c/spec/multi-memory/data.txt

@@ -0,0 +1,5 @@
+;;; TOOL: run-spec-wasm2c
+;;; STDIN_FILE: third_party/testsuite/proposals/multi-memory/data.wast
+(;; STDOUT ;;;
+14/14 tests passed.
+;;; STDOUT ;;)

test/wasm2c/spec/multi-memory/memory.txt

@@ -0,0 +1,5 @@
+;;; TOOL: run-spec-wasm2c
+;;; STDIN_FILE: third_party/testsuite/proposals/multi-memory/memory.wast
+(;; STDOUT ;;;
+45/45 tests passed.
+;;; STDOUT ;;)

test/wasm2c/spec/multi-memory/memory_grow.txt

@@ -0,0 +1,5 @@
+;;; TOOL: run-spec-wasm2c
+;;; STDIN_FILE: third_party/testsuite/proposals/multi-memory/memory_grow.wast
+(;; STDOUT ;;;
+131/131 tests passed.
+;;; STDOUT ;;)

test/wasm2c/spec/multi-memory/memory_size.txt

@@ -0,0 +1,5 @@
+;;; TOOL: run-spec-wasm2c
+;;; STDIN_FILE: third_party/testsuite/proposals/multi-memory/memory_size.wast
+(;; STDOUT ;;;
+40/40 tests passed.
+;;; STDOUT ;;)