Previously, this was broken - by setting PointerToSymbolTable to zero
but still actually writing the string table length, the object file
header was corrupted.

Differential Revision: https://reviews.llvm.org/D56584

llvm-svn: 350926

Differential Revision: https://reviews.llvm.org/D55881

llvm-svn: 350893

Differential Revision: https://reviews.llvm.org/D55922

llvm-svn: 350168

This fixes all cases of errors in asan+ubsan builds.

Also use std::copy instead of if+memcpy in the previously updated spot,
for consistency.

llvm-svn: 349826

It is invalid to call memcpy with a null pointer, even if the size
is zero.

This should fix the sanitizer buildbot.

llvm-svn: 349808

This is an initial implementation of no-op passthrough copying of COFF
with objcopy.

Differential Revision: https://reviews.llvm.org/D54939

llvm-svn: 349605