Fix the test for gcc.

Following 3 changes were made.
1. Test was assuming that function name will have () in the end. I dont know why lldb is generating function name like this but it looks like a bug. For this test, I have removed it.
2. Step instruction test was assuming that function call will not be the first instruction in the range of the line. This assumption failed with gcc. So I had fixed this.
3. Some minor adjustments with the line number.

Test with bot gcc and clang and all tests pass.

This test is still very fragile. We should be removing hardcoded line number.

llvm-svn: 232372