- Update comment.

- Switch `alignment` to `constexpr size_t`.

Author: rorth

openmp/runtime/src/kmp_alloc.cpp

@@ -70,8 +70,8 @@ static void bectl(kmp_info_t *th, bget_compact_t compact,
 /* Buffer allocation size quantum: all buffers allocated are a
    multiple of this size.  This MUST be a power of two. */
 
-/* On IA-32 architecture with  Linux* OS, malloc() does not
-   ensure 16 byte alignment */
+/* On some architectures, malloc() does not ensure 16 byte alignment,
+   Solaris/sparc and x86 among them. */
 
 #if KMP_ARCH_X86 || KMP_ARCH_SPARC || !KMP_HAVE_QUAD
 
@@ -1861,7 +1861,7 @@ typedef struct kmp_mem_desc { // Memory block descriptor
   void *ptr_align; // Pointer to aligned memory, returned
   kmp_allocator_t *allocator; // allocator
 } kmp_mem_desc_t;
-static int alignment = SizeQuant;
+constexpr size_t alignment = SizeQuant;
 
 // external interfaces are wrappers over internal implementation
 void *__kmpc_alloc(int gtid, size_t size, omp_allocator_handle_t allocator) {