PPC: Correct Size for GETtlsADDR

PPC::GETtlsADDR is lowered to a branch and a nop, by the assembly
printer. Its size was incorrectly marked as 4, correct it to 8. The
incorrect size can cause incorrect branch relaxation in
PPCBranchSelector under the right conditions.

llvm-svn: 303904
GitOrigin-RevId: 13379d7c99f3dca3f36af36ddce6032cc11ce38a
1 file changed