Make lots of tests run in parallel

Putting t.Parallel() in each test makes them run in parallel.
Additional t.Parallel() could be added to each subtest, although
that requires making a local copy of the loop variable for
table driven tests.

Test: m checkbuild
Change-Id: I5d9869ead441093f4d7c5757f2447385333a95a4

rust/binary_test.go

@@ -23,6 +23,7 @@ import (
 
 // Test that rustlibs default linkage is correct for binaries.
 func TestBinaryLinkage(t *testing.T) {
+	t.Parallel()
 	ctx := testRust(t, `
 		rust_binary {
 			name: "fizz-buzz",
@@ -86,6 +87,7 @@ func TestBinaryPreferRlib(t *testing.T) {
 
 // Test that the path returned by HostToolPath is correct
 func TestHostToolPath(t *testing.T) {
+	t.Parallel()
 	ctx := testRust(t, `
 		rust_binary_host {
 			name: "fizz-buzz",
@@ -100,6 +102,7 @@ func TestHostToolPath(t *testing.T) {
 
 // Test that the flags being passed to rust_binary modules are as expected
 func TestBinaryFlags(t *testing.T) {
+	t.Parallel()
 	ctx := testRust(t, `
 		rust_binary_host {
 			name: "fizz-buzz",
@@ -143,6 +146,7 @@ func TestStaticBinaryFlags(t *testing.T) {
 }
 
 func TestLinkObjects(t *testing.T) {
+	t.Parallel()
 	ctx := testRust(t, `
 		rust_binary {
 			name: "fizz-buzz",
@@ -162,6 +166,7 @@ func TestLinkObjects(t *testing.T) {
 
 // Test that stripped versions are correctly generated and used.
 func TestStrippedBinary(t *testing.T) {
+	t.Parallel()
 	ctx := testRust(t, `
 		rust_binary {
 			name: "foo",