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

The `initializes` parameter attribute was introduced in
5ece35df8586d0cb8c104a9f44eaae771de025f5 (llvm-project). The lowered
function bodies indicate that the attribute is correct.

Match the attribute using a wildcard regex because it appears only in
-O mode and is not relevant to these tests.

Author: AnthonyLatsis

test/IRGen/non_fixed_return.swift

@@ -55,14 +55,14 @@ func create<T>(_ t: T) -> C<T> {
 // We use opaque storage types because LLVM performs type based analysis based
 // on the sret storage type which goes wrong with non fixed types.
 
-// CHECK-LABEL: define hidden swiftcc void @"$s16non_fixed_return1CVACyxGycfC"(ptr noalias sret(%swift.opaque) %0
+// CHECK-LABEL: define hidden swiftcc void @"$s16non_fixed_return1CVACyxGycfC"(ptr noalias sret(%swift.opaque){{.*}} %0
 
 // CHECK-LABEL: define hidden swiftcc void @"$s16non_fixed_return6createyAA1CVyxGxlF"(ptr noalias sret(%swift.opaque) %0, ptr noalias %1, ptr %T)
 // CHECK:  call swiftcc void @"$s16non_fixed_return1CVACyxGycfC"(ptr noalias sret(%swift.opaque) %0
 // CHECK:  ret void
 
 // Make sure we don't loose the stores for the optional UInt32? in optimize mode.
-// OPT-LABEL: define hidden swiftcc void @"$s16non_fixed_return1CVACyxGycfC"(ptr noalias sret(%swift.opaque) %0
+// OPT-LABEL: define hidden swiftcc void @"$s16non_fixed_return1CVACyxGycfC"(ptr noalias sret(%swift.opaque){{.*}} %0
 // OPT:  store i32 0, ptr [[BASE:%[0-9]+]]
 // OPT:  [[ADDR2:%.*]] = getelementptr inbounds nuw i8, ptr [[BASE]], i64 4
 // OPT:  store i8 1, ptr [[ADDR2]]

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"