Since d6de1e1a71406c75a4ea4d5a2fe84289f07ea3a1, no attributes is quivalent to
setting attribute to false.
This is a preliminary commit for https://reviews.llvm.org/D99080
Currently, for indirect call, the assembly code printed out as
callx <imm>
This is not right, it should be
callx <reg>
Fixed the issue with proper format.
Differential Revision: https://reviews.llvm.org/D69229
llvm-svn: 375386