[CodeGen][TailDuplicator] Don't duplicate blocks with INLINEASM_BR
Tail duplication of a block with an INLINEASM_BR may result in a PHI
node on the indirect branch. This is okay, but it also introduces a copy
for that PHI node *after* the INLINEASM_BR, which is not okay.
Differential Revision: https://reviews.llvm.org/D88823
(cherry picked from commit d2c61d2bf9bd1efad49acba2f2751112522686aa)