Assert that Process::FindInEnvPath() is passed a relative path.

It misbehaves with absolute paths. (So does path::append().)
Goes with clang r235787.

llvm-svn: 235788
diff --git a/llvm/lib/Support/Process.cpp b/llvm/lib/Support/Process.cpp
index 3571cd3..6dcbb47 100644
--- a/llvm/lib/Support/Process.cpp
+++ b/llvm/lib/Support/Process.cpp
@@ -29,6 +29,7 @@
 Optional<std::string> Process::FindInEnvPath(const std::string& EnvName,
                                              const std::string& FileName)
 {
+  assert(!path::is_absolute(FileName));
   Optional<std::string> FoundPath;
   Optional<std::string> OptPath = Process::GetEnv(EnvName);
   if (!OptPath.hasValue())