[rebranch][test] IRGen: Adjust check for new LLVM parameter attribute

The parameter expectedly has an additional `initializes` parameter when
optimizations are enabled. This attribute was introduced in
5ece35df8586d0cb8c104a9f44eaae771de025f5 (llvm-project).

Author: AnthonyLatsis

test/IRGen/pre_specialize.swift

@@ -42,12 +42,12 @@
 // specialized InternalThing.computedX.getter
 // CHECK-A-DAG: define{{( dllexport)?}}{{( protected)?}} swiftcc [[INT]] @"$s1A13InternalThingV9computedXxvgSi_Ts5"([[INT]]{{( returned)?}} %0)
 // specialized InternalThing.computedX.setter
-// CHECK-A-DAG: define{{( dllexport)?}}{{( protected)?}} swiftcc void @"$s1A13InternalThingV9computedXxvsSi_Ts5"([[INT]] %0, ptr swiftself {{(writeonly )?}}captures(none) dereferenceable({{(4|8)}}) %1)
+// CHECK-A-DAG: define{{( dllexport)?}}{{( protected)?}} swiftcc void @"$s1A13InternalThingV9computedXxvsSi_Ts5"([[INT]] %0, ptr swiftself {{(writeonly )?}}captures(none) dereferenceable({{(4|8)}}) {{.*}}%1)
 
 // specialized InternalThing.subscript.getter
 // CHECK-A-DAG: define{{( dllexport)?}}{{( protected)?}} swiftcc [[INT]] @"$s1A13InternalThingVyxSicigSi_Ts5"([[INT]] %0, [[INT]]{{( returned)?}} %1)
 // specialized InternalThing.subscript.setter
-// CHECK-A-DAG: define{{( dllexport)?}}{{( protected)?}} swiftcc void @"$s1A13InternalThingVyxSicisSi_Ts5"([[INT]] %0, [[INT]] %1, ptr swiftself {{(writeonly )?}}captures(none) dereferenceable({{(4|8)}}) %2)
+// CHECK-A-DAG: define{{( dllexport)?}}{{( protected)?}} swiftcc void @"$s1A13InternalThingVyxSicisSi_Ts5"([[INT]] %0, [[INT]] %1, ptr swiftself {{(writeonly )?}}captures(none) dereferenceable({{(4|8)}}) {{.*}}%2)
 
 // specialized InternalRef.compute()
 // CHECK-A-FRAG-DAG: define{{( dllexport)?}}{{( protected)?}} swiftcc [[INT:(i64|i32)]] @"$s1A11InternalRefC7computexyFAA09ResilientA10BoxedThingVySiG_Ts5"