[wasm] iwyu part 3

BUG=v8:7490

Change-Id: I10f5339f3d7e634934d59d744334a045276fbed6
Reviewed-on: https://chromium-review.googlesource.com/1041906Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52951}

src/wasm/signature-map.cc

@@ -4,6 +4,8 @@
 
 #include "src/wasm/signature-map.h"
 
+#include "src/signature.h"
+
 namespace v8 {
 namespace internal {
 namespace wasm {

src/wasm/signature-map.h

@@ -7,13 +7,19 @@
 
 #include <map>
 
-#include "src/signature.h"
-#include "src/wasm/wasm-opcodes.h"
+#include "src/machine-type.h"
 
 namespace v8 {
 namespace internal {
+
+template <typename T>
+class Signature;
+
 namespace wasm {
 
+using ValueType = MachineRepresentation;
+using FunctionSig = Signature<ValueType>;
+
 // A signature map canonicalizes signatures into a range of indices so that
 // two different {FunctionSig} instances with the same contents map to the
 // same index.

src/wasm/wasm-module.h

@@ -12,10 +12,10 @@
 #include "src/handles.h"
 #include "src/objects/managed.h"
 #include "src/parsing/preparse-data.h"
-
 #include "src/wasm/decoder.h"
 #include "src/wasm/signature-map.h"
 #include "src/wasm/wasm-constants.h"
+#include "src/wasm/wasm-opcodes.h"
 
 namespace v8 {
 namespace internal {