[Bug ld/27433] RISC-V linker might lose relax opportunities since "again" doesn't work as expected

[nelsonc1225 at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27433

--- Comment #2 from Nelson Chu <nelsonc1225 at sourceware dot org> ---
The attached is the proposed solution.  We use a new boolean "restart_relax" to
determine if we need to re-run the whole relax passes again from 0 to 2.  Once
we have deleted the code between relax pass 0 to 2, the "restart_relax" will be
set to TRUE, and then we should re-run the whole relaxations again to give them
more chances to shorten the code.  We will only enter into the relax pass 3
when the "restart_relax" is FALSE, since we can't relax anything else once we
start to handle the alignments.

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