Use 0x00... as the magic constant to write in st0. That should be reliably 0 regardless of OS/hardware

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@193877 91177308-0d34-0410-b5e6-96231b3b80d8
<rdar://problem/15368142>

For this test case, one needs to get the name of the symbol since we don't have debug info to generate an SBFunction



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@193879 91177308-0d34-0410-b5e6-96231b3b80d8