[lit] Delete dead code related to enabling +0 normal arguments.

We always compile with a plus_zero_runtime now.

Author: gottesmm

test/SILGen/enum_resilience_testable.swift

@@ -1,4 +1,3 @@
-// REQUIRES: plus_zero_runtime
 
 // RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend -emit-module -enable-resilience -emit-module-path=%t/resilient_struct.swiftmodule -module-name=resilient_struct %S/../Inputs/resilient_struct.swift

test/SILGen/value_ownership.swift

@@ -1,7 +1,5 @@
 // RUN: %target-swift-emit-silgen -enable-sil-ownership -emit-verbose-sil %s | %FileCheck %s
 
-// REQUIRES: plus_zero_runtime
-
 protocol OwnershipProto {
   __consuming func elided(_ default: String, _ shared: __shared String, _ owned: __owned String)
 

test/lit.site.cfg.in

@@ -88,11 +88,6 @@ config.available_features.add("CMAKE_GENERATOR=@CMAKE_GENERATOR@")
 if "@SWIFT_ENABLE_SOURCEKIT_TESTS@" == "TRUE":
     config.available_features.add('sourcekit')
 
-if "@SWIFT_ENABLE_GUARANTEED_NORMAL_ARGUMENTS@" == "TRUE":
-   config.available_features.add('plus_zero_runtime')
-else:
-   config.available_features.add('plus_one_runtime')
-
 # Let the main config do the real work.
 if config.test_exec_root is None:
     config.test_exec_root = os.path.dirname(os.path.realpath(__file__))