Added a few initial tests for swift_driver.

These tests currently only exercise the "swift_driver -driver-print-actions"
functionality, but at this point that is the only part of the driver which is
reasonably testable without the expectation that tests will break as output
formats change.

Swift SVN r10934

Author: cwakamo

test/Driver/actions.swift

@@ -0,0 +1,29 @@
+// RUN: %swift_driver -driver-print-actions %s 2>&1 | FileCheck %s -check-prefix=BASIC
+// BASIC: 0: input, "{{.*}}actions.swift", swift
+// BASIC: 1: compile, {0}, object
+// BASIC: 2: link, {1}, image
+
+// RUN: %swift_driver -driver-print-actions -c %s 2>&1 | FileCheck %s -check-prefix=BASICC
+// BASICC: 0: input, "{{.*}}actions.swift", swift
+// BASICC: 1: compile, {0}, object
+
+// RUN: %swift_driver -driver-print-actions -emit-sil %s 2>&1 | FileCheck %s -check-prefix=BASICSIL
+// BASICSIL: 0: input, "{{.*}}actions.swift", swift
+// BASICSIL: 1: compile, {0}, sil
+
+// RUN: %swift_driver -driver-print-actions -emit-silgen %s 2>&1 | FileCheck %s -check-prefix=BASICSILGEN
+// BASICSILGEN: 0: input, "{{.*}}actions.swift", swift
+// BASICSILGEN: 1: compile, {0}, sil
+
+// RUN: %swift_driver -driver-print-actions -S %s 2>&1 | FileCheck %s -check-prefix=BASICASM
+// BASICASM: 0: input, "{{.*}}actions.swift", swift
+// BASICASM: 1: compile, {0}, assembly
+
+// RUN: %swift_driver -driver-print-actions %S/Inputs/main.swift %S/Inputs/empty.swift %s 2>&1 | FileCheck %s -check-prefix=MULTI
+// MULTI: 0: input, "{{.*}}Inputs/main.swift", swift
+// MULTI: 1: compile, {0}, object
+// MULTI: 2: input, "{{.*}}Inputs/empty.swift", swift
+// MULTI: 3: compile, {2}, object
+// MULTI: 4: input, "{{.*}}actions.swift", swift
+// MULTI: 5: compile, {4}, object
+// MULTI: 6: link, {1, 3, 5}, image