For PR797:

Make sys::Program::ExecuteAndWait not throw exceptions and update any
affected code. It now return -9999 to signal that the program couldn't be
executed. Only one case (in bugpoint) actually examines the result code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29785 91177308-0d34-0410-b5e6-96231b3b80d8

lib/System/Unix/Program.inc

@@ -108,7 +108,7 @@ Program::ExecuteAndWait(const Path& path,
                         unsigned secondsToWait
 ) {
   if (!path.canExecute())
-    throw path.toString() + " is not executable"; 
+    return -9999;
 
 #ifdef HAVE_SYS_WAIT_H
   // Create a child process.