runtime: fix issues on AIX about uintptr(_t)

    
    Reviewed-on: https://go-review.googlesource.com/69891

From-SVN: r253664

gcc/go/gofrontend/MERGE

-adc6eb826f156d0980f0ad9f9efc5c919ec4905e
+af46ad16dc34773877068393d331ac8ae34b2219
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/runtime/go-caller.c

@@ -159,7 +159,7 @@ syminfo_callback (void *data, uintptr_t pc __attribute__ ((unused)),
 /* Set *VAL to the value of the symbol for PC.  */
 
 static _Bool
-__go_symbol_value (uintptr_t pc, uintptr_t *val)
+__go_symbol_value (uintptr pc, uintptr *val)
 {
   *val = 0;
   backtrace_syminfo (__go_get_backtrace_state (), pc, syminfo_callback,

libgo/runtime/proc.c

@@ -179,7 +179,7 @@ fixcontext(ucontext_t* c)
 // So we make the field larger in runtime2.go and pick an appropriate
 // offset within the field here.
 static ucontext_t*
-ucontext_arg(uintptr* go_ucontext)
+ucontext_arg(uintptr_t* go_ucontext)
 {
 	uintptr_t p = (uintptr_t)go_ucontext;
 	size_t align = __alignof__(ucontext_t);