InstrProf: Change the extension of the default profile

Change the name of the default profile dumped by compiler-rt to
default.profraw.  This distinguishes it more clearly from the
(incompatible) format output by llvm-profdata that is read by clang
-fprofile-instr-use.

llvm-svn: 204676
diff --git a/compiler-rt/lib/profile/InstrProfilingFile.c b/compiler-rt/lib/profile/InstrProfilingFile.c
index 84b13b6..1ce7cae 100644
--- a/compiler-rt/lib/profile/InstrProfilingFile.c
+++ b/compiler-rt/lib/profile/InstrProfilingFile.c
@@ -85,7 +85,7 @@
 #define UPDATE_FILENAME(NextFilename) \
   if (!Filename || !Filename[0]) Filename = NextFilename
   UPDATE_FILENAME(getenv("LLVM_PROFILE_FILE"));
-  UPDATE_FILENAME("default.profdata");
+  UPDATE_FILENAME("default.profraw");
 #undef UPDATE_FILENAME
 
   /* Check the filename for "%p", which indicates a pid-substitution. */