[NVPTX] Address warning and typo in fp128 support

Author: AlexMaclean

llvm/test/CodeGen/NVPTX/fp128-storage-type.ll

@@ -1,6 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
 ; RUN: llc < %s -mcpu=sm_20 | FileCheck %s
-; RUN: %if ptxas %{ llc < %s-mcpu=sm_20 | %ptxas-verify %}
+; RUN: %if ptxas %{ llc < %s -mcpu=sm_20 | %ptxas-verify %}
 
 target triple = "nvptx64-unknown-cuda"