[lldb] Print message after loading 'crashlog' command

Previously, importing `crashlog` resulted in a message being printed. The
message was about other commands (those in heap.py), not `crashlog`. The
changes in D117237 made it so that the heap.py messages were printed only when
importing `lldb.macosx.heap`, not when importing `lldb.macosx.crashlog`. Some
users may see no output and think `crashlog` wasn't successfully loaded. This
ensures users see that `crashlog` is loaded.

rdar://88283132

Differential Revision: https://reviews.llvm.org/D119155

Author: kastiglione

lldb/examples/python/crashlog.py

@@ -1247,3 +1247,5 @@ def __lldb_init_module(debugger, internal_dict):
         'command script add -c lldb.macosx.crashlog.Symbolicate crashlog')
     debugger.HandleCommand(
         'command script add -f lldb.macosx.crashlog.save_crashlog save_crashlog')
+    print('"crashlog" and "save_crashlog" commands have been installed, use '
+          'the "--help" options on these commands for detailed help.')

lldb/test/Shell/Heap/heap-cstr.test

@@ -6,6 +6,8 @@
 br set -p return
 command script import lldb.macosx.heap
 run
-cstr "patatino"
+cstr_refs "patatino"
+
+# CHECK: "cstr_refs", {{.*}} commands have been installed, use the "--help" options on these commands
 
 # CHECK: {{.*}}: malloc(    16) -> {{.*}}

lldb/test/Shell/ScriptInterpreter/Python/Crashlog/json.test

@@ -8,6 +8,8 @@
 # RUN: %python %S/patch-crashlog.py --binary %t.out --crashlog %t.nometadata.crash --offsets '{"main":20, "bar":9, "foo":16}' --json --no-metadata
 # RUN: %lldb %t.out -o 'command script import lldb.macosx.crashlog' -o 'crashlog %t.nometadata.crash' 2>&1 | FileCheck %s
 
+# CHECK: "crashlog" {{.*}} commands have been installed, use the "--help" options on these commands
+
 # CHECK: Thread[0] Crashing Thread Name EXC_BAD_ACCESS (SIGSEGV) (KERN_INVALID_ADDRESS at 0x0000000000000000)
 # CHECK: [  0] {{.*}}out`foo + 16 at test.c
 # CHECK: [  1] {{.*}}out`bar + 8 at test.c

lldb/test/Shell/ScriptInterpreter/Python/Crashlog/no_threadState.test

@@ -4,6 +4,8 @@
 # RUN: %python %S/patch-crashlog.py --binary %t.out --crashlog %t.crash --offsets '{"main":20, "bar":9, "foo":16}' --json
 # RUN: %lldb %t.out -o 'command script import lldb.macosx.crashlog' -o 'crashlog %t.crash' 2>&1 | FileCheck %s
 
+# CHECK: "crashlog" {{.*}} commands have been installed, use the "--help" options on these commands
+
 # CHECK: Thread[0] Crashing Thread Name EXC_BAD_ACCESS (SIGSEGV) (KERN_INVALID_ADDRESS at 0x0000000000000000)
 # CHECK: [  0] {{.*}}out`foo + 16 at test.c
 # CHECK: [  1] {{.*}}out`bar + 8 at test.c

lldb/test/Shell/ScriptInterpreter/Python/Crashlog/text.test

@@ -3,6 +3,8 @@
 # RUN: %python %S/patch-crashlog.py --binary %t.out --crashlog %t.crash --offsets '{"main":20, "bar":9, "foo":16}'
 # RUN: %lldb %t.out -o 'command script import lldb.macosx.crashlog' -o 'crashlog %t.crash' 2>&1 | FileCheck %s
 
+# CHECK: "crashlog" {{.*}} commands have been installed, use the "--help" options on these commands
+
 # CHECK: Thread[0] EXC_BAD_ACCESS (SIGSEGV) (KERN_INVALID_ADDRESS at 0x0000000000000000)
 # CHECK: [  0] {{.*}}out`foo + 16 at test.c
 # CHECK: [  1] {{.*}}out`bar + 8 at test.c