Merging r357885:

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r357885 | ruiu | 2019-04-07 23:45:07 -0700 (Sun, 07 Apr 2019) | 13 lines

Fix -emit-reloc against local symbols.

Previously, we drop symbols starting with .L from the symbol table, so
if there is a relocation that refers a .L symbol, it ended up
referencing a null -- which happened to be interpreted as an absolute
symbol.

This patch copies all symbols including local ones if -emit-reloc is
given.

Fixes https://bugs.llvm.org/show_bug.cgi?id=41385

Differential Revision: https://reviews.llvm.org/D60306
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llvm-svn: 359956