Rebaseline size tests using CIRCLECI env var

Author: aheejin

test/code_size/embind_hello_wasm.json

@@ -3,8 +3,8 @@
   "a.html.gz": 380,
   "a.js": 9593,
   "a.js.gz": 4230,
-  "a.wasm": 7615,
-  "a.wasm.gz": 3471,
-  "total": 17760,
-  "total_gz": 8081
+  "a.wasm": 7498,
+  "a.wasm.gz": 3446,
+  "total": 17643,
+  "total_gz": 8056
 }

test/code_size/embind_val_wasm.json

@@ -3,8 +3,8 @@
   "a.html.gz": 380,
   "a.js": 6724,
   "a.js.gz": 2900,
-  "a.wasm": 9528,
-  "a.wasm.gz": 4896,
-  "total": 16804,
-  "total_gz": 8176
+  "a.wasm": 9268,
+  "a.wasm.gz": 4765,
+  "total": 16544,
+  "total_gz": 8045
 }