cmd/compile: avoid implicit bounds checks after explicit checks for append

The generated code for the append builtin already checks if the appended
to slice is large enough and calls growslice if that is not the case.
Trust that this ensures the slice is large enough and avoid the
implicit bounds check when slicing the slice to its new size.

Removes 365 panicslice calls (-14%) from the go binary which
reduces the binary size by ~12kbyte.

Change-Id: I1b88418675ff409bc0b956853c9e95241274d5a6
Reviewed-on: https://go-review.googlesource.com/c/119315


Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>