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Reland "[compiler-rt] Simple crtbegin.o and crtend.o implementation"

Description

Reland "[compiler-rt] Simple crtbegin.o and crtend.o implementation"

Clang relies on existence of certain symbols that are normally
provided by crtbegin.o/crtend.o. However, LLVM does not currently
provide implementation of these files, instead relying on either
libgcc or implementations provided as part of the system.

This change provides an initial implementation of crtbegin.o/crtend.o
that can be used on system that don't provide crtbegin.o/crtend.o as
part of their C library.

Differential Revision: https://reviews.llvm.org/D28791

Details

Committed
phosekApr 30 2019, 11:13 AM
Differential Revision
D28791: [compiler-rt][crt] Simple crtbegin and crtend implementation
Parents
rL359590: fix broken test
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