test: Fix test/IRGen/stdlib/Mutex.swift for 32-bit platforms

The test was failing on 32-bit platforms because the offset of the
layout of struct metadata depends on the pointer size.

| Field                   | Type | Offset (32-bit) | Offset (64-bit) |
|-------------------------|------|-----------------|-----------------|
| Layout String Pointer   | ptr  | 4 * (-2)        | 4 * (-4)        |
| VWT                     | ptr  | 4 * (-1)        | 4 * (-2)        |
| Metadata Flags          | ptr  | 4 * 0           | 4 * 0           |
| Nominal Type Descriptor | ptr  | 4 * 1           | 4 * 2           |
| Generic Requirement     | ptr  | 4 * 2           | 4 * 4           |
| Field Offset for handle | i32  | 4 * 3           | 4 * 6           |
| Field Offset for value  | i32  | 4 * 4           | 4 * 7           |

Author: kateinoigakukun

test/IRGen/stdlib/Mutex.swift

@@ -33,10 +33,10 @@ final class Awaitable<Value, Failure>: Sendable where Value: Sendable, Failure:
 // CHECK:   [[DEST_HANDLE_PTR:%.*]] = getelementptr inbounds %T15Synchronization5MutexV, ptr [[DEST]], i32 0, i32 0
 // CHECK:   [[SRC_HANDLE_PTR:%.*]] = getelementptr inbounds %T15Synchronization5MutexV, ptr [[SRC]], i32 0, i32 0
 // CHECK:   call void @llvm.memcpy.p0.p0.i{{32|64}}(ptr {{.*}} [[DEST_HANDLE_PTR]], ptr {{.*}} [[SRC_HANDLE_PTR]], i{{32|64}} {{.*}}, i1 false)
-// CHECK:   [[DEST_MUTEX_VALUE_OFFSET_PTR:%.*]] = getelementptr inbounds i32, ptr [[MUTEX]], i{{32|64}} 7
+// CHECK:   [[DEST_MUTEX_VALUE_OFFSET_PTR:%.*]] = getelementptr inbounds i32, ptr [[MUTEX]], i{{32 4|64 7}}
 // CHECK:   [[DEST_MUTEX_VALUE_OFFSET:%.*]] = load i32, ptr [[DEST_MUTEX_VALUE_OFFSET_PTR]]
 // CHECK:   [[DEST_VALUE_PTR:%.*]] = getelementptr inbounds i8, ptr [[DEST]], i32 [[DEST_MUTEX_VALUE_OFFSET]]
-// CHECK:   [[SRC_MUTEX_VALUE_OFFSET_PTR:%.*]] = getelementptr inbounds i32, ptr [[MUTEX]], i{{32|64}} 7
+// CHECK:   [[SRC_MUTEX_VALUE_OFFSET_PTR:%.*]] = getelementptr inbounds i32, ptr [[MUTEX]], i{{32 4|64 7}}
 // CHECK:   [[SRC_MUTEX_VALUE_OFFSET:%.*]] = load i32, ptr [[SRC_MUTEX_VALUE_OFFSET_PTR]]
 // CHECK:   [[SRC_VALUE_PTR:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i32 [[SRC_MUTEX_VALUE_OFFSET]]