[PowerPC][lit] Recognize triple ppc64le.*-linux

Some Linux distributions, e.g. Red Hat, use the triple
ppc64le-redhat-linux. Add a pattern that treats ppc64le.*-linux as
powerpc64le-linux during test execution.

Reviewed By: qiucf

Differential Revision: https://reviews.llvm.org/D149746

Author: tuliom

llvm/utils/lit/lit/llvm/config.py

@@ -147,6 +147,8 @@ def __init__(self, lit_config, config):
                 features.add("target-aarch64")
             elif re.match(r"^arm.*", target_triple):
                 features.add("target-arm")
+            if re.match(r'^ppc64le.*-linux', target_triple):
+                features.add('target=powerpc64le-linux')
 
         use_gmalloc = lit_config.params.get("use_gmalloc", None)
         if lit.util.pythonize_bool(use_gmalloc):