Bug 882779 - Do not attempt to run the LLVM PR8927 test when building with Clang on Windows; r=ted

This is needed for now because of the following LLVM bug:
http://llvm.org/bugs/show_bug.cgi?id=16319

configure.in

@@ -2882,7 +2882,11 @@ AC_SUBST(VISIBILITY_FLAGS)
 
 MOZ_GCC_PR49911
 MOZ_GCC_PR39608
-MOZ_LLVM_PR8927
+if test "$OS_TARGET" != WINNT; then
+    # Only run this test with clang on non-Windows platforms, because clang
+    # cannot do enough code gen for now to make this test work correctly.
+    MOZ_LLVM_PR8927
+fi
 
 dnl Check for __force_align_arg_pointer__ for SSE2 on gcc
 dnl ========================================================

js/src/configure.in

@@ -2457,7 +2457,11 @@ AC_SUBST(VISIBILITY_FLAGS)
 
 MOZ_GCC_PR49911
 MOZ_GCC_PR39608
-MOZ_LLVM_PR8927
+if test "$OS_TARGET" != WINNT; then
+    # Only run this test with clang on non-Windows platforms, because clang
+    # cannot do enough code gen for now to make this test work correctly.
+    MOZ_LLVM_PR8927
+fi
 
 dnl Checks for header files.
 dnl ========================================================