gopls/internal/regtest: fix the workspace symbols benchmark

This benchmark was using 'stressTestOptions', which avoid regtest hooks
(and therefore can't wait on IWL).

Change-Id: Id54f291ed42146e82f4d34b5db962b92fac1d6c8
Reviewed-on: https://go-review.googlesource.com/c/tools/+/338690
Trust: Robert Findley <rfindley@google.com>
Trust: Rebecca Stambler <rstambler@golang.org>
Run-TryBot: Robert Findley <rfindley@google.com>
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>

gopls/internal/regtest/bench/bench_test.go

diff --git a/gopls/internal/regtest/bench/bench_test.go b/gopls/internal/regtest/bench/bench_test.go
index 360e956..3363014 100644
--- a/gopls/internal/regtest/bench/bench_test.go
+++ b/gopls/internal/regtest/bench/bench_test.go
@@ -91,7 +91,7 @@
 		t.Skip("-symbol_workdir not configured")
 	}
 
-	opts := stressTestOptions(symbolOptions.workdir)
+	opts := benchmarkOptions(symbolOptions.workdir)
 	conf := EditorConfig{}
 	if symbolOptions.matcher != "" {
 		conf.SymbolMatcher = &symbolOptions.matcher