Fix Python SyntaxWarning in //scripts/build/wasm-as.py.

In Python 3.12, unrecognized escape character sequences in a string
produce a "SyntaxWarning" log message when the file is parsed. The
fix is (usually) to change the string from a regular string to a raw
string, by putting an "r" in front of the leading quote.

Bug: 376746798
Change-Id: Ie888a8de6ae42c4daae6fa5028134722634d70c1
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/5981155
Commit-Queue: Dirk Pranke <[email protected]>
Reviewed-by: Michael Achenbach <[email protected]>
Reviewed-by: Liviu Rau <[email protected]>

Author: dpranke

scripts/build/wasm-as.py

@@ -54,7 +54,7 @@ def script_main(args):
         options.output
     ])
     (size, offset) = re.search(
-        b'Section {[^}]*Type: CODE[^}]*Size: (\d*)[^}]*Offset: (\d*)[^}]*}',
+        rb'Section {[^}]*Type: CODE[^}]*Size: (\d*)[^}]*Offset: (\d*)[^}]*}',
         wasm_obj_headers).groups()
 
     # readobj reports as offset the location of the first byte of the header.