[iwyu][wasm] Fix IWYU violations

R=titzer@chromium.org

Bug: v8:7965
Change-Id: I5e44e8a4dd522703e7a20e32abae1f66ba44451e
Reviewed-on: https://chromium-review.googlesource.com/1148566Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54661}

src/wasm/function-body-decoder-impl.h

@@ -8,6 +8,7 @@
 // Do only include this header for implementing new Interface of the
 // WasmFullDecoder.
 
+#include "src/base/platform/elapsed-timer.h"
 #include "src/bit-vector.h"
 #include "src/wasm/decoder.h"
 #include "src/wasm/function-body-decoder.h"

src/wasm/wasm-constants.h

@@ -5,6 +5,9 @@
 #ifndef V8_WASM_WASM_CONSTANTS_H_
 #define V8_WASM_WASM_CONSTANTS_H_
 
+#include <cstddef>
+#include <cstdint>
+
 namespace v8 {
 namespace internal {
 namespace wasm {

tools/generate-header-include-checks.py

@@ -114,11 +114,6 @@ AUTO_EXCLUDE = [
   'src/third_party/utf8-decoder/utf8-decoder.h',
   'src/transitions.h',
   'src/v8memory.h',
-  'src/wasm/function-body-decoder-impl.h',
-  'src/wasm/streaming-decoder.h',
-  'src/wasm/wasm-constants.h',
-  'src/wasm/wasm-objects.h',
-  'src/wasm/wasm-serialization.h',
 ]
 AUTO_EXCLUDE_PATTERNS = [
   'src/base/atomicops_internals_.*',