[Bug rtl-optimization/62146] CSE replaces constant with an expression incorrectly

[eraman at google dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62146

--- Comment #1 from Easwaran Raman <eraman at google dot com> ---
Created attachment 33331
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33331&action=edit
Patch to remove obsolete REG_EQUAL note during RTL copy prop

This patch kills the REG_EQUAL note during cprop when the propagated value is a
constant. This doesn't the CSE problem that conflates 0 and the symbol.