Automatic rebaseline of codesize expectations. NFC

This is an automatic change generated by tools/maint/rebaseline_tests.py.

The following (2) test expectation files were updated by
running the tests with `--rebaseline`:

```
code_size/embind_hello_wasm.json: 16505 => 16451 [-54 bytes / -0.33%]
code_size/embind_val_wasm.json: 16158 => 16104 [-54 bytes / -0.33%]

Average change: -0.33% (-0.33% - -0.33%)
```

Author: aheejin

test/code_size/embind_hello_wasm.json

@@ -3,8 +3,8 @@
   "a.html.gz": 380,
   "a.js": 8609,
   "a.js.gz": 3806,
-  "a.wasm": 7344,
-  "a.wasm.gz": 3368,
-  "total": 16505,
-  "total_gz": 7554
+  "a.wasm": 7290,
+  "a.wasm.gz": 3343,
+  "total": 16451,
+  "total_gz": 7529
 }

test/code_size/embind_val_wasm.json

@@ -3,8 +3,8 @@
   "a.html.gz": 380,
   "a.js": 6469,
   "a.js.gz": 2800,
-  "a.wasm": 9137,
-  "a.wasm.gz": 4700,
-  "total": 16158,
-  "total_gz": 7880
+  "a.wasm": 9083,
+  "a.wasm.gz": 4682,
+  "total": 16104,
+  "total_gz": 7862
 }