gdb/mi: add no-history stop reason

When executing in reverse and runs out of recorded history, GDB prints
a warning to the user, but does not add a reason in the stopped record,
for example:

*stopped,frame={addr="0x000000000040113e",func="main",args=[],file="/home/blarsen/Documents/fsf_build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.reverse/solib-reverse.c",fullname="/home/blarsen/Documents/binutils-gdb/gdb/testsuite/gdb.reverse/solib-reverse.c",line="27",arch="i386:x86-64"},thread-id="1",stopped-threads="all",core="1"

This problem was reported as record/29260.

This commit adds the reason no-history to the record, making it easier
for interfaces using the mi interpreter to report the result.  It also
changes the test gdb.mi/mi-reverse.exp to test that the reason shows up
correctly.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29260

2 files changed, 2 insertions, 0 deletions

diff --git a/gdb/mi/mi-common.c b/gdb/mi/mi-common.c
index 51a8aaa..ce70d11 100644
--- a/gdb/mi/mi-common.c
+++ b/gdb/mi/mi-common.c
@@ -39,6 +39,7 @@ static const char * const async_reason_string_lookup[] =
   "syscall-entry",
   "syscall-return",
   "exec",
+  "no-history",
   NULL
 };
 
diff --git a/gdb/mi/mi-common.h b/gdb/mi/mi-common.h
index 6a1aea3..dfb8353 100644
--- a/gdb/mi/mi-common.h
+++ b/gdb/mi/mi-common.h
@@ -42,6 +42,7 @@ enum async_reply_reason
   EXEC_ASYNC_SYSCALL_ENTRY,
   EXEC_ASYNC_SYSCALL_RETURN,
   EXEC_ASYNC_EXEC,
+  EXEC_ASYNC_NO_HISTORY,
   /* This is here only to represent the number of enums.  */
   EXEC_ASYNC_LAST
 };