internal/lsp/source: canonicalize objects in reference/rename requests

With generics, instantiated object may have differing pointer
identities. Fix references/rename requests for instantiated
methods/fields by using a canonical object identity of (pos, pkg, name).

Fixes golang/go#51672

Change-Id: I0021ca562b8a74dadb616cf6864cb0bdd0165cc3
Reviewed-on: https://go-review.googlesource.com/c/tools/+/392480
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

gopls: update go.mod file to pick up CL 392914

For golang/go#51219

Change-Id: Ib60fc1f22ce9ff094bc87ec36ad9e2c07c422c6e
Reviewed-on: https://go-review.googlesource.com/c/tools/+/392915
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

gopls: update go.mod file to pick up CL 392914

For golang/go#51219

Change-Id: Ib60fc1f22ce9ff094bc87ec36ad9e2c07c422c6e
Reviewed-on: https://go-review.googlesource.com/c/tools/+/392915
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

gopls: update go.mod file for v0.8.1

For golang/go#51219

Change-Id: I62982e0ea084f78e81ec5ea6d6a0b6a039941968
Reviewed-on: https://go-review.googlesource.com/c/tools/+/392634
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
Reviewed-by: Suzy Mueller <suzmue@golang.org>
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gopls: update go.mod to pick up CL 389494

Update to include recently cherry-picked x/tools changes.

For golang/go#51074

Change-Id: Iae465b09b9c1f751c118d43eb37910696a72ebdd
Reviewed-on: https://go-review.googlesource.com/c/tools/+/389714
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

gopls: update go.mod to pick up CL 389494

Update to include recently cherry-picked x/tools changes.

For golang/go#51074

Change-Id: Iae465b09b9c1f751c118d43eb37910696a72ebdd
Reviewed-on: https://go-review.googlesource.com/c/tools/+/389714
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

gopls: update go.mod file for v0.8.0

For golang/go#51074

Change-Id: I6ebe3470d4a3113566eaa26f32e611d3bb8ffcd1
Reviewed-on: https://go-review.googlesource.com/c/tools/+/388694
Trust: Robert Findley <rfindley@google.com>
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gopls: update go.mod file for v0.8.0-pre.2 to pick up CL 386537

For golang/go#51074

Change-Id: I5471419cfe554ff6be3181e2594dbf5e6e7f421d
Reviewed-on: https://go-review.googlesource.com/c/tools/+/386734
Trust: Robert Findley <rfindley@google.com>
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Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
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gopls: update go.mod file for v0.8.0-pre.1

For golang/go#51074

Change-Id: Ia39e065480248a85a46d2b3fbbc3acb4f1ae927e
Reviewed-on: https://go-review.googlesource.com/c/tools/+/384116
Trust: Robert Findley <rfindley@google.com>
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Reviewed-by: Suzy Mueller <suzmue@golang.org>
gopls-CI: kokoro <noreply+kokoro@google.com>
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internal/lsp/regtest: eliminate arbitrary timeouts

We care that gopls operations complete within a reasonable time.
However, what is “reasonable” depends strongly on the specifics of the
user and the hardware they are running on: a timeout that would be
perfectly reasonable on a high-powered user workstation with little
other load may be far too short on an overloaded and/or underpowered
CI builder.

This change adjusts the regtest runner to use the test deadline
instead of an arbitrary, flag-defined timeout; we expect the user or
system running the test to scale the test timeout appropriately to the
specific platform and system load.

When the testing package gains support for per-test timeouts
(golang/go#48157), this approach will automatically apply those
timeouts too.

If we decide that we also want to test specific performance and/or
latency targets, we can set up specific configurations for that (as
either aggressive per-test timeouts or benchmarks) in a followup
change.

For golang/go#50582

Change-Id: I1ab11b2049effb097aa620046fe11609269f91c4
Reviewed-on: https://go-review.googlesource.com/c/tools/+/380497
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>