[llvm-lit] remove %t files before running a test

[Tzafrir Poupko]

Before running a test, purge all %t files used by previous tests.
Remove any custom file used in test which was prefixed by %t.
There are over 300 clang tests that run "rm -rf %t" as first run command,
this patch will make it automaticlly.
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diff --git a/llvm/utils/lit/lit/TestRunner.py b/llvm/utils/lit/lit/TestRunner.py
index f4f72b2..8a52b7e 100644
--- a/llvm/utils/lit/lit/TestRunner.py
+++ b/llvm/utils/lit/lit/TestRunner.py
@@ -520,6 +520,8 @@ def _runShTest(test, litConfig, useExternalSh,
                    script, tmpBase, execdir):
     # Create the output directory if it does not already exist.
     lit.util.mkdir_p(os.path.dirname(tmpBase))
+    # Remove all temporary files relevant to this test if any exists
+    lit.util.purge(tmpBase + '.tmp')
 
     if useExternalSh:
         res = executeScript(test, litConfig, tmpBase, script, execdir)
diff --git a/llvm/utils/lit/lit/util.py b/llvm/utils/lit/lit/util.py
index 08f7b71..efbdfa1 100644
--- a/llvm/utils/lit/lit/util.py
+++ b/llvm/utils/lit/lit/util.py
@@ -60,6 +60,11 @@ def mkdir_p(path):
         if e.errno != errno.EEXIST:
             raise
 
+def purge(path):
+    """purge(path) - Remove all files and folders starting with this path
+    prefix"""
+    subprocess.call(['rm','-rf',path+"*"])
+
 def capture(args, env=None):
     """capture(command) - Run the given command (or argv list) in a shell and
     return the standard output."""