Bug fix for Bugzilla bug 26602: Remove function bodies with KMP_ASSERT(0)

Fix for bugzilla https://llvm.org/bugs/show_bug.cgi?id=26602.  Removed functions
body consisted of the only KMP_ASSERT(0) statement.  Thus possible runtime crash
converted to compile-time error, which looks preferable (faster possible error
detection).

TODO: consider C++11 static assert as an alternative, that could
make the diagnostics better.

Patch by Andrey Churbanov

Differential Revision: http://reviews.llvm.org/D21304

llvm-svn: 272590
diff --git a/openmp/runtime/src/kmp_dispatch.cpp b/openmp/runtime/src/kmp_dispatch.cpp
index 71c3a40..c99d51b 100644
--- a/openmp/runtime/src/kmp_dispatch.cpp
+++ b/openmp/runtime/src/kmp_dispatch.cpp
@@ -190,7 +190,7 @@
 // test_then_add template (general template should NOT be used)
 template< typename T >
 static __forceinline T
-test_then_add( volatile T *p, T d ) { KMP_ASSERT(0); };
+test_then_add( volatile T *p, T d );
 
 template<>
 __forceinline kmp_int32
@@ -213,7 +213,7 @@
 // test_then_inc_acq template (general template should NOT be used)
 template< typename T >
 static __forceinline T
-test_then_inc_acq( volatile T *p ) { KMP_ASSERT(0); };
+test_then_inc_acq( volatile T *p );
 
 template<>
 __forceinline kmp_int32
@@ -236,7 +236,7 @@
 // test_then_inc template (general template should NOT be used)
 template< typename T >
 static __forceinline T
-test_then_inc( volatile T *p ) { KMP_ASSERT(0); };
+test_then_inc( volatile T *p );
 
 template<>
 __forceinline kmp_int32
@@ -259,7 +259,7 @@
 // compare_and_swap template (general template should NOT be used)
 template< typename T >
 static __forceinline kmp_int32
-compare_and_swap( volatile T *p, T c, T s ) { KMP_ASSERT(0); };
+compare_and_swap( volatile T *p, T c, T s );
 
 template<>
 __forceinline kmp_int32