Merging r338599:

Merging r338599:
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r338599 | vlad.tsyrklevich | 2018-08-01 19:44:37 +0200 (Wed, 01 Aug 2018) | 16 lines

[X86] FastISel fall back on !absolute_symbol GVs

Summary:
D25878, which added support for !absolute_symbol for normal X86 ISel,
did not add support for materializing references to absolute symbols for
X86 FastISel. This causes build failures because FastISel generates
PC-relative relocations for absolute symbols. Fall back to normal ISel
for references to !absolute_symbol GVs. Fix for PR38200.

Reviewers: pcc, craig.topper

Reviewed By: pcc

Subscribers: hiraditya, llvm-commits, kcc

Differential Revision: https://reviews.llvm.org/D50116
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_70@338847 91177308-0d34-0410-b5e6-96231b3b80d8