[lldb] Fix version string when using LLDB_REVISION but not LLDB_REPOS…

…ITORY

Summary:
lldb's format string (line one) is:
`lldb version $clang_version ($lldb_repo revision $lldb_revision)`

When only using $lldb_revision and not $lldb_repo, this might look like:
`lldb version 11 ( revision 12345)`
which looks pretty ugly.

Aside: I'm not sure we really need all the different versions since we've moved to the monorepo layout -- I don't think anyone is using different llvm/clang/lldb revisions, are they? We could likely tidy this up further if we knew how people consumed the output of lldb --version.

Reviewers: labath, JDevlieghere, friss

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D74859

lldb/source/lldb.cpp

@@ -50,8 +50,10 @@ const char *lldb_private::GetVersion() {
       g_version_str += " (";
       if (lldb_repo)
         g_version_str += lldb_repo;
+      if (lldb_repo && lldb_rev)
+        g_version_str += " ";
       if (lldb_rev) {
-        g_version_str += " revision ";
+        g_version_str += "revision ";
         g_version_str += lldb_rev;
       }
       g_version_str += ")";