[Bug binutils/30282] risc-v: objdump is really slow

[nelsonc1225 at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30282

--- Comment #1 from Nelson Chu <nelsonc1225 at sourceware dot org> ---
Created attachment 14785
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14785&action=edit
Proposed solution v1

I guess the massive dis-assembler slowdown is caused by searching the mapping
symbol, so I try to re-write the code to increase the dump.  Please see the
attached for the details, and and FIXME there should be a better solution.

Anyway, it did not see significant improvement when running the gcc regression
again...  So maybe it just work for some special cases, or still have other
reason that slow down the whole thing, not really sure about that.

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