Allow 64K page size as a valid option on AIX

xlpCodeCacheTests fails on AIX because the default
code cache large page size 64K is absent in the
list of available code cache large page sizes
output by `-verbose:sizes`.

Include 64K in the list of available code cache
large page sizes for the test to parse as the
expected page size when no `-Xlp` option is
supplied and the default page size is used.

Signed-off-by: Amarpreet Singh amarpreet1997@gmail.com

port/aix/omrvmem.c

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 1991, 2020 IBM Corp. and others
+ * Copyright (c) 1991, 2021 IBM Corp. and others
  *
  * This program and the accompanying materials are made available under
  * the terms of the Eclipse Public License 2.0 which accompanies this
@@ -949,12 +949,14 @@ omrvmem_find_valid_page_size(struct OMRPortLibrary *portLibrary, uintptr_t mode,
 
 	if (0 != validPageSize) {
 		/* For executable pages search through the list of supported page sizes only if
+		 * - request is for 64K pages, or
 		 * - request is for 16M pages, and
 		 * - 64 bit system OR (32 bit system AND CodeCacheConsolidation is enabled)
 		 */
 #if defined(OMR_ENV_DATA64)
-		if ((OMRPORT_VMEM_MEMORY_MODE_EXECUTE != (OMRPORT_VMEM_MEMORY_MODE_EXECUTE & mode)) ||
-			(SIXTEEN_M == validPageSize))
+		if ((OMRPORT_VMEM_MEMORY_MODE_EXECUTE != (OMRPORT_VMEM_MEMORY_MODE_EXECUTE & mode))
+			|| (SIXTY_FOUR_K == validPageSize)
+			|| (SIXTEEN_M == validPageSize)
 #else
 		BOOLEAN codeCacheConsolidationEnabled = FALSE;
 
@@ -967,10 +969,11 @@ omrvmem_find_valid_page_size(struct OMRPortLibrary *portLibrary, uintptr_t mode,
 				codeCacheConsolidationEnabled = TRUE;
 			}
 		}
-		if ((OMRPORT_VMEM_MEMORY_MODE_EXECUTE != (OMRPORT_VMEM_MEMORY_MODE_EXECUTE & mode)) ||
-			((TRUE == codeCacheConsolidationEnabled) && (SIXTEEN_M == validPageSize)))
+		if ((OMRPORT_VMEM_MEMORY_MODE_EXECUTE != (OMRPORT_VMEM_MEMORY_MODE_EXECUTE & mode))
+			|| ((TRUE == codeCacheConsolidationEnabled) && (SIXTEEN_M == validPageSize))
+			|| (SIXTY_FOUR_K == validPageSize)
 #endif /* defined(OMR_ENV_DATA64) */
-		{
+		) {
 			uintptr_t pageIndex = 0;
 			uintptr_t *supportedPageSizes = portLibrary->vmem_supported_page_sizes(portLibrary);
 			uintptr_t *supportedPageFlags = portLibrary->vmem_supported_page_flags(portLibrary);