Apply name change to src/* files.

These changes are mostly in comments, but there are a few
that aren't.  Change libiomp5 => libomp everywhere.  One internal
function name is changed in kmp_gsupport.c, and in kmp_i18n.c, the
static char[] variable 'name' is changed to "libomp".

llvm-svn: 238712
diff --git a/openmp/runtime/src/kmp_affinity.cpp b/openmp/runtime/src/kmp_affinity.cpp
index 4e9fc4d..d9ff4e6 100644
--- a/openmp/runtime/src/kmp_affinity.cpp
+++ b/openmp/runtime/src/kmp_affinity.cpp
@@ -123,7 +123,7 @@
 //
 // Unfortunately, my attempts to reproduce it in a smaller example have
 // failed - I'm not sure what the prospects are of getting it fixed
-// properly - but we need a reproducer smaller than all of libiomp.
+// properly - but we need a reproducer smaller than all of libomp.
 //
 // Work around the problem by avoiding inline constructors in such builds.
 // We do this for all platforms, not just Linux* OS - non-inline functions are