Convert CodeGen/*/*.ll tests to use the new CHECK-LABEL for easier debugging. No functionality change and all tests pass after conversion.

This was done with the following sed invocation to catch label lines demarking function boundaries:
    sed -i '' "s/^;\( *\)\([A-Z0-9_]*\):\( *\)test\([A-Za-z0-9_-]*\):\( *\)$/;\1\2-LABEL:\3test\4:\5/g" test/CodeGen/*/*.ll
which was written conservatively to avoid false positives rather than false negatives. I scanned through all the changes and everything looks correct.

llvm-svn: 186258
diff --git a/llvm/test/CodeGen/AArch64/addsub_ext.ll b/llvm/test/CodeGen/AArch64/addsub_ext.ll
index 2dd1662..0bda0f9 100644
--- a/llvm/test/CodeGen/AArch64/addsub_ext.ll
+++ b/llvm/test/CodeGen/AArch64/addsub_ext.ll
@@ -186,4 +186,4 @@
 ; CHECK: add {{x[0-9]+}}, {{x[0-9]+}}, {{w[0-9]+}}, sxtw #2
 
     ret void
-}
\ No newline at end of file
+}