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nm/objdump --hep still display unsupported styles about --demangle.

From: nora-pxh
Subject: nm/objdump --hep still display unsupported styles about --demangle.
Date: Wed, 10 Nov 2021 17:02:01 +0800 (GMT+08:00)

Hello, I find a problem about usage.
The commit 1910070b298052d7ca8e4024891465824588c1e9 fixed demangle.h to
remove support for ancient GNU (pre-3.0), Lucid, ARM, HP, and EDG demangling styles.
But usage of nm and objdump is still show the following message.
  -C, --demangle[=STYLE] Decode low-level symbol names into user-level names
                          The STYLE, if specified, can be `auto' (the default),
                          `gnu', `lucid', `arm', `hp', `edg', `gnu-v3', `java'
                          or `gnat'
So  if you execute --demangle=gnu, it will display error message: unknown demangling style gnu. 
Would you delete unsupported  styles from usage of nm and objdump?


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