[analyzer] Don't do string concat in String.startsWith
When analyzing rwf-materials (562 contexts) with a filled cache I get
these numbers:
Before this CL (i.e. parent CL):
102829 ms
100934 ms
100991 ms
With this CL:
99671 ms
98499 ms
99678 ms
Difference at 95.0% confidence
-2302 +/- 2041.63
-2.26609% +/- 2.00979%
(Student's t, pooled s = 900.749)
Change-Id: I30025b15f7b8c637d83b2cef234c0e7a602535f3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/305680
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
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