Optimizer: remove the AllocVectorLowering pass

It's not needed anymore, because the "FixedArray" experimental feature is replaced by inline-arrays.

Author: eeckstein

SwiftCompilerSources/Sources/Optimizer/FunctionPasses/AllocVectorLowering.swift

@@ -7,7 +7,6 @@
 # See http://swift.org/CONTRIBUTORS.txt for Swift project authors
 
 swift_compiler_sources(Optimizer
-  AllocVectorLowering.swift
   AssumeSingleThreaded.swift
   AsyncDemotion.swift
   BooleanLiteralFolding.swift

SwiftCompilerSources/Sources/Optimizer/FunctionPasses/CMakeLists.txt

@@ -68,7 +68,6 @@ private func registerSwiftPasses() {
   registerPass(stackProtection, { stackProtection.run($0) })
 
   // Function passes
-  registerPass(allocVectorLowering, { allocVectorLowering.run($0) })
   registerPass(asyncDemotion, { asyncDemotion.run($0) })
   registerPass(booleanLiteralFolding, { booleanLiteralFolding.run($0) })
   registerPass(letPropertyLowering, { letPropertyLowering.run($0) })

SwiftCompilerSources/Sources/Optimizer/PassManager/PassRegistration.swift

@@ -1141,12 +1141,6 @@ NOTE(rbi_add_generic_parameter_sendable_conformance,none,
 ERROR(deinit_not_visible, none,
       "deinit of non-copyable type not visible in the current module", ())
 
-ERROR(vector_capacity_not_constant, none,
-      "vector capacity needs to be constant", ())
-
-ERROR(fixed_arrays_not_available, none,
-      "fixed arrays are only available with -enable-experimental-feature FixedArrays", ())
-
 ERROR(lifetime_variable_outside_scope, none,
       "lifetime-dependent variable '%0' escapes its scope", (Identifier))
 ERROR(lifetime_value_outside_scope, none,

include/swift/AST/DiagnosticsSIL.def

@@ -429,8 +429,6 @@ SWIFT_FUNCTION_PASS(NamedReturnValueOptimization, "named-return-value-optimizati
     "Optimize copies to an indirect return value")
 SWIFT_FUNCTION_PASS(StripObjectHeaders, "strip-object-headers",
     "Sets the bare flag on objects which don't need their headers")
-SWIFT_FUNCTION_PASS(AllocVectorLowering, "alloc-vector-lowering",
-     "lowering of allocVector builtins")
 PASS(SimplifyBBArgs, "simplify-bb-args",
      "SIL Block Argument Simplification")
 PASS(SimplifyCFG, "simplify-cfg",

include/swift/SILOptimizer/PassManager/Passes.def

@@ -257,7 +257,6 @@ static void addMandatoryDiagnosticOptPipeline(SILPassPipelinePlan &P) {
 
   P.addMandatoryPerformanceOptimizations();
   P.addOnoneSimplification();
-  P.addAllocVectorLowering();
   P.addInitializeStaticGlobals();
 
   // MandatoryPerformanceOptimizations might create specializations that are not