Ian Lance Taylor c96fc08123 cmd/go: look for tool build ID before hashing entire file
Also fix the key used to store the ID.
    
    This is a significant speedup in cmd/go run time.
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/194257

From-SVN: r275559
2019-09-10 02:48:24 +00:00
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