Ruby

Implement equality for CI comparison when CC searching

When we're searching for CCs, compare the argc and flags for CI rather
than comparing pointers. This means we don't need to store a reference
to the CI, and it also naturally "de-duplicates" CC objects.

We can observe the effect with the following code:

require "objspace" hash = {} p ObjectSpace.memsize_of(Hash) eval ("a".."zzz").map { |key| "hash.merge(:#{key} => 1)" }.join("; ") p ObjectSpace.memsize_of(Hash) 

On master:

$ ruby -v test.rb ruby 3.4.0dev (2024-04-15T16:21:41Z master d019b3baec) [arm64-darwin23] test.rb:3: warning: assigned but unused variable - hash 3424 527736 

On this branch:

$ make runruby compiling vm.c linking miniruby builtin_binary.inc updated compiling builtin.c linking static-library libruby.3.4-static.a ln -sf ../../rbconfig.rb .ext/arm64-darwin23/rbconfig.rb linking ruby ld: warning: ignoring duplicate libraries: '-ldl', '-lobjc', '-lpthread' RUBY_ON_BUG='gdb -x ./.gdbinit -p' ./miniruby -I./lib -I. -I.ext/common ./tool/runruby.rb --extout=.ext -- --disable-gems ./test.rb 2240 2368 

Co-authored-by: John Hawthorn jhawthorn@github.com