Fix tests

Author: aschwaighofer

test/IRGen/large_argument_result_c.swift

@@ -2,6 +2,11 @@
 
 // REQUIRES: PTRSIZE=64
 
+// Whether llvm can remove the first two memcmp's dependents on the ABI (arm64's
+// PCS, says stack arguments might be written to; x86-64 ABI copies indirect
+// parameters for the call)
+// REQUIRES: CPU=arm64 || CPU=arm64e
+
 // CHECK: define swiftcc void @"$s23large_argument_result_c7runTestyySo0A6_thingaF"(ptr {{.*}} %0)
 // CHECK:  [[CALL_ALLOCA:%.*]] = alloca <{ %Ts6UInt64V, %Ts6UInt64V, %Ts6UInt64V
 // CHECK:  [[TMP_ALLOCA:%.*]] = alloca %TSo11large_thinga, align 8

test/IRGen/large_argument_result_c_x86_64.swift

@@ -0,0 +1,21 @@
+// RUN: %target-swift-frontend %S/large_argument_result_c.swift -Osize -import-objc-header %S/Inputs/large_argument_result_c.h -emit-ir -o - 2>&1 | %FileCheck %s
+
+// REQUIRES: PTRSIZE=64
+
+// Whether llvm can remove the first two memcmp's dependents on the ABI (arm64's
+// PCS, says stack arguments might be written to; x86-64 ABI copies indirect
+// parameters for the call)
+// REQUIRES: CPU=x86_64
+
+// CHECK: define {{.*}}swiftcc void @"$s23large_argument_result_c7runTestyySo0A6_thingaF"(ptr {{.*}} %0)
+// CHECK:  [[CALL_ALLOCA:%.*]] = alloca <{ %Ts6UInt64V, %Ts6UInt64V, %Ts6UInt64V
+// CHECK:  call void @pass_and_return(ptr {{.*}} [[CALL_ALLOCA]], ptr nonnull byval{{.*}} %0, ptr nonnull byval{{.*}} %0)
+// CHECK:  call {{.*}} @swift_allocObject
+// CHECK:  [[BOX:%.*]] = {{.*}}call noalias ptr @swift_allocObject(
+// CHECK:  [[ADDR_IN_BOX:%.*]] = getelementptr inbounds <{ %swift.refcounted, [128 x i8] }>, ptr [[BOX]], i64 0, i32 1
+// CHECK:  call void @llvm.memcpy.p0.p0.i64(ptr {{.*}} [[ADDR_IN_BOX]], ptr {{.*}} [[CALL_ALLOCA]], i64 128, i1 false)
+// CHECK:  call void @llvm.lifetime.end.p0(i64 128, ptr nonnull [[CALL_ALLOCA]])
+public func runTest(_ l : large_thing) {
+  let r = pass_and_return(l, l)
+  print(r)
+}