Replace 'stack base' with 'stack bottom' in the documentation

* README.md (The C Interface to the Allocator): Outline that stack base
means its bottom; remove a note that client should set GC_stackbottom
on HP PA machines manually.
* doc/README.macros (USE_GET_STACKBASE_FOR_MAIN): Rename "stack base"
to "stack bottom".
* doc/porting.md (Adding Platforms to gcconfig.h): Likewise.
* doc/porting.md (Adding Platforms to gcconfig.h): Rename
"cool end of the stack" to "cold end of the stack"; refine
documentation about STACKBOTTOM.
* include/private/gcconfig.h (STACKBOTTOM): Rename "cool end" to
"cold end" in comment.
* include/gc.h (GC_stackbottom): Likewise.
* include/private/gcconfig.h (LINUX_STACKBOTTOM): Rename "stack base"
to "stack bottom" in comment.
* include/gc.h (GC_stack_base, GC_call_with_stack_base): Likewise.
* include/gc.h [GC_THREADS] (GC_register_my_thread): Likewise.
* misc.c [!THREADS] (GC_call_with_gc_active): Likewise.
* os_dep.c [LINUX_STACKBOTTOM] (GC_linux_main_stack_base): Likewise.
* os_dep.c (GC_get_stack_base): Likewise.
* pthread_support.c (GC_call_with_gc_active): Likewise.
* win32_threads.c (GC_call_with_gc_active): Likewise.

1 files changed, 1 insertions, 1 deletions

diff --git a/misc.c b/misc.c
index 21baef8f..5b473569 100644
--- a/misc.c
+++ b/misc.c
@@ -2128,7 +2128,7 @@ GC_API void * GC_CALL GC_call_with_gc_active(GC_fn_type fn,
     struct GC_traced_stack_sect_s stacksect;
     GC_ASSERT(GC_is_initialized);
 
-    /* Adjust our stack base value (this could happen if        */
+    /* Adjust our stack bottom pointer (this could happen if    */
     /* GC_get_main_stack_base() is unimplemented or broken for  */
     /* the platform).                                           */
     if ((word)GC_stackbottom HOTTER_THAN (word)(&stacksect))