Bug 1458588 - Create objdir/tmp if it doesn't exist during mach run;r…

…=ahal

This fixes `./mach run --temp-profile` after a clobber.

MozReview-Commit-ID: 7xoH5RCSpXx

--HG--
extra : rebase_source : b26f54b6ac4b0d9020fb803f9fb8c51ea51f511d

python/mozbuild/mozbuild/mach_commands.py

@@ -898,10 +898,14 @@ def run(self, params, remote, background, noprofile, disable_e10s,
                 for pref in prefs:
                     prefs[pref] = Preferences.cast(prefs[pref])
 
+                tmpdir = os.path.join(self.topobjdir, 'tmp')
+                if not os.path.exists(tmpdir):
+                    os.makedirs(tmpdir)
+
                 if (temp_profile):
-                    path = tempfile.mkdtemp(dir=os.path.join(self.topobjdir, 'tmp'), prefix='profile-')
+                    path = tempfile.mkdtemp(dir=tmpdir, prefix='profile-')
                 else:
-                    path = os.path.join(self.topobjdir, 'tmp', 'profile-default')
+                    path = os.path.join(tmpdir, 'profile-default')
 
                 profile = Profile(path, preferences=prefs)
                 args.append('-profile')