Ensure that v8.code_parser recognizes code.asm

Browser builds do not ship with disassembler enabled. Which means
code.asm will not contain any optimized code dumps, but v8.code_parser
is looking for a code specific marker to detect code.asm files.

Change canRecognize predicate to guarantee that code.asm is recognized
even if it contains only deoptimizations or only source dumps.