Fixed a bug where the expression parser relied on having symbols for things...

Fixed a bug where the expression parser relied on having symbols for things even if they were in the debug info.

The issue can happen if you strip your main executable and then run an expression and it would fail to find the stripped symbol and it would then not be able to make the function call. The issue was fixed by doing our normal FindFunctions call.

<rdar://problem/20072750>

llvm-svn: 231667