Marcin Koscielnicki a44d44cb2e [PowerPC] [PR27387] Disallow r0 for ADD8TLS.
ADD8TLS, a variant of add instruction used for initial-exec TLS,
currently accepts r0 as a source register.  While add itself supports
r0 just fine, linker can relax it to a local-exec sequence, converting
it to addi - which doesn't support r0.

Differential Revision: http://reviews.llvm.org/D19193

llvm-svn: 267388
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