Support of link time symbols reorder to improve performance

[陈云星 via Gcc-help <gcc-help@xxxxxxxxxxx>]

>From llvm community: https://reviews.llvm.org/rG1a33c0f2422c97dbfdbf11e561bb7823d71e3145 <https://reviews.llvm.org/rG1a33c0f2422c97dbfdbf11e561bb7823d71e3145>

LLD linker has an option :  --symbol-ordering-file

Which support direct linker to sort symbol in result object by a user supplied file;

This improve performance by reduce instruction cache miss.

The hottest function will cluster and code cache hit rate will be high.

Does gnu linker can support this ?