Port GetMainExecutable over to PathV2.

I will remove the V1 version as soon as I change clang in the next commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184914 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
index 5151d1a..fc3ab68 100644
--- a/tools/llvm-config/llvm-config.cpp
+++ b/tools/llvm-config/llvm-config.cpp
@@ -162,11 +162,11 @@
 }
 
 /// \brief Compute the path to the main executable.
-llvm::sys::Path GetExecutablePath(const char *Argv0) {
+std::string GetExecutablePath(const char *Argv0) {
   // This just needs to be some symbol in the binary; C++ doesn't
   // allow taking the address of ::main however.
   void *P = (void*) (intptr_t) GetExecutablePath;
-  return llvm::sys::Path::GetMainExecutable(Argv0, P);
+  return llvm::sys::fs::getMainExecutable(Argv0, P);
 }
 
 int main(int argc, char **argv) {
@@ -180,7 +180,7 @@
   // tree.
   bool IsInDevelopmentTree;
   enum { MakefileStyle, CMakeStyle, CMakeBuildModeStyle } DevelopmentTreeLayout;
-  llvm::SmallString<256> CurrentPath(GetExecutablePath(argv[0]).str());
+  llvm::SmallString<256> CurrentPath(GetExecutablePath(argv[0]));
   std::string CurrentExecPrefix;
   std::string ActiveObjRoot;