Respect include_inlines when looking up functions in SymbolFileDWARF

Summary:
SymbolFileDWARF was not respecting the include_inlines argument in function lookup in all code
paths. This resulted in an attempt to call an inlined function during expression evaluation,
which is impossible, and usually resulted in a segfault in the inferior. This patch makes sure
include_inlines is respected in all code paths.

Reviewers: clayborg

Subscribers: lldb-commits, sivachandra

Differential Revision: http://reviews.llvm.org/D8286

llvm-svn: 232151