Swift Optimizer: make the RunUnitTests a module pass

Which makes more sense. At the time RunUnitTests was added, there were no module passes, yet.

Author: eeckstein

SwiftCompilerSources/Sources/Optimizer/TestPasses/RunUnitTests.swift

@@ -14,8 +14,8 @@ import SIL
 
 /// This pass should only be used by sil-opt to run all the unit tests.
 ///
-let runUnitTests = FunctionPass(name: "run-unit-tests", {
-  (function: Function, context: PassContext) in
+let runUnitTests = ModulePass(name: "run-unit-tests", {
+    (context: ModulePassContext) in
 
   print("--- Run unit tests ---")
 

include/swift/SILOptimizer/PassManager/Passes.def

@@ -401,7 +401,7 @@ PASS(SILDebugInfoGenerator, "sil-debuginfo-gen",
      "Generate Debug Information with Source Locations into Textual SIL")
 PASS(EarlySROA, "early-sroa",
      "Scalar Replacement of Aggregate Stack Objects on high-level SIL")
-SWIFT_FUNCTION_PASS(RunUnitTests, "run-unit-tests",
+SWIFT_MODULE_PASS(RunUnitTests, "run-unit-tests",
      "Runs the compiler internal unit tests")
 SWIFT_FUNCTION_PASS(SILPrinter, "sil-printer",
      "Test pass which prints the SIL of a function")

test/SILOptimizer/swift-unit-tests.sil

@@ -2,10 +2,3 @@
 
 // REQUIRES: swift_in_compiler
 
-// The RunUnitTests is a function pass. Therefore we need one function is this file to trigger the pass run.
-sil @trigger_test_run : $@convention(thin) () -> () {
-bb0:
-  %r = tuple()
-  return %r : $()
-}
-