tvm/contrib/rocm: improve finding of ld.lld (#3664)
tvm/contrib/rocm: improve finding of ld.lld (#3664)

This refines the detection of ld.lld matching the neighbouring clang
file. This is particularly helpful on Ubuntu/Debian when either the
default ld.lld is not installed or the versioned one is preferable for
consistency.

@tqchen I think you last touched the clang equivalent in #3590 .
Laurawly/tvm-1,Huyuwei/tvm,sxjscience/tvm,Laurawly/tvm-1,sxjscience/tvm,Laurawly/tvm-1,dmlc/tvm,Huyuwei/tvm,sxjscience/tvm,dmlc/tvm,Huyuwei/tvm,Huyuwei/tvm,sxjscience/tvm,Huyuwei/tvm,tqchen/tvm,dmlc/tvm,Laurawly/tvm-1,Laurawly/tvm-1,tqchen/tvm,Laurawly/tvm-1,Laurawly/tvm-1,tqchen/tvm,dmlc/tvm,dmlc/tvm,tqchen/tvm,sxjscience/tvm,Huyuwei/tvm,Laurawly/tvm-1,tqchen/tvm,Laurawly/tvm-1,sxjscience/tvm,Huyuwei/tvm,tqchen/tvm,dmlc/tvm,Huyuwei/tvm,tqchen/tvm,Huyuwei/tvm,tqchen/tvm,dmlc/tvm,sxjscience/tvm,dmlc/tvm,sxjscience/tvm,tqchen/tvm,Laurawly/tvm-1,sxjscience/tvm,tqchen/tvm,dmlc/tvm