[iwyu] Fixes related to src/machine-type.h

Restores some sensemaking properties, such as making src/machine-type.h (lower
level header) independent of src/zone/zone.h (higher level header).

BUG=v8:7490

Change-Id: Ibc6e5c7a75e4aaf917d086cf70267abc7ee9a9b0
Reviewed-on: https://chromium-review.googlesource.com/1039586Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52941}

src/compiler/code-assembler.h

@@ -44,6 +44,9 @@ class InterpreterData;
 class Factory;
 class Zone;
 
+template <typename T>
+class Signature;
+
 struct UntaggedT {};
 
 struct IntegralT : UntaggedT {};

src/compiler/int64-lowering.h

@@ -14,6 +14,10 @@
 
 namespace v8 {
 namespace internal {
+
+template <typename T>
+class Signature;
+
 namespace compiler {
 
 class V8_EXPORT_PRIVATE Int64Lowering {

src/compiler/linkage.h

@@ -14,6 +14,7 @@
 #include "src/machine-type.h"
 #include "src/reglist.h"
 #include "src/runtime/runtime.h"
+#include "src/signature.h"
 #include "src/zone/zone.h"
 
 namespace v8 {

src/compiler/simd-scalar-lowering.h

@@ -14,6 +14,10 @@
 
 namespace v8 {
 namespace internal {
+
+template <typename T>
+class Signature;
+
 namespace compiler {
 
 class SimdScalarLowering {

src/machine-type.h

@@ -9,8 +9,6 @@
 
 #include "src/base/bits.h"
 #include "src/globals.h"
-#include "src/signature.h"
-#include "src/zone/zone.h"
 
 namespace v8 {
 namespace internal {
@@ -294,8 +292,6 @@ V8_EXPORT_PRIVATE inline int ElementSizeLog2Of(MachineRepresentation rep) {
   UNREACHABLE();
 }
 
-typedef Signature<MachineType> MachineSignature;
-
 }  // namespace internal
 }  // namespace v8
 

src/signature.h

@@ -6,6 +6,7 @@
 #define V8_SIGNATURE_H_
 
 #include "src/base/iterator.h"
+#include "src/machine-type.h"
 #include "src/zone/zone.h"
 
 namespace v8 {
@@ -98,6 +99,8 @@ class Signature : public ZoneObject {
   const T* reps_;
 };
 
+typedef Signature<MachineType> MachineSignature;
+
 }  // namespace internal
 }  // namespace v8
 

src/wasm/local-decl-encoder.cc

@@ -4,6 +4,7 @@
 
 #include "src/wasm/local-decl-encoder.h"
 
+#include "src/signature.h"
 #include "src/wasm/leb-helper.h"
 
 namespace v8 {

src/wasm/wasm-objects.h

@@ -9,9 +9,9 @@
 #include "src/debug/debug.h"
 #include "src/debug/interface-types.h"
 #include "src/heap/heap.h"
-#include "src/machine-type.h"
 #include "src/objects.h"
 #include "src/objects/script.h"
+#include "src/signature.h"
 
 // Has to be the last include (doesn't have include guards)
 #include "src/objects/object-macros.h"

src/wasm/wasm-opcodes.h

@@ -6,6 +6,7 @@
 #define V8_WASM_WASM_OPCODES_H_
 
 #include "src/globals.h"
+#include "src/vector.h"
 #include "src/wasm/value-type.h"
 #include "src/wasm/wasm-constants.h"