minimal changes to avoid Artifacts to get invalidated by some common definitions in ecosystem (#49603)

(cherry picked from commit 43c9202)

Author: KristofferC

base/binaryplatforms.jl

@@ -1015,19 +1015,19 @@ function platforms_match(a::AbstractPlatform, b::AbstractPlatform)
 
         # Throw an error if `a` and `b` have both set non-default comparison strategies for `k`
         # and they're not the same strategy.
-        if a_comp != compare_default && b_comp != compare_default && a_comp != b_comp
+        if a_comp !== compare_default && b_comp !== compare_default && a_comp !== b_comp
             throw(ArgumentError("Cannot compare Platform objects with two different non-default comparison strategies for the same key \"$(k)\""))
         end
 
         # Select the custom comparator, if we have one.
         comparator = a_comp
-        if b_comp != compare_default
+        if b_comp !== compare_default
             comparator = b_comp
         end
 
         # Call the comparator, passing in which objects requested this comparison (one, the other, or both)
         # For some comparators this doesn't matter, but for non-symmetrical comparisons, it does.
-        if !(comparator(ak, bk, a_comp == comparator, b_comp == comparator)::Bool)
+        if !(comparator(ak, bk, a_comp === comparator, b_comp === comparator)::Bool)
             return false
         end
     end
@@ -1073,7 +1073,9 @@ function select_platform(download_info::Dict, platform::AbstractPlatform = HostP
     # of generally choosing the latest release (e.g. a `libgfortran5` tarball
     # rather than a `libgfortran3` tarball)
     p = last(sort(ps, by = p -> triplet(p)))
-    return download_info[p]
+
+    # @invokelatest here to not get invalidated by new defs of `==(::Function, ::Function)`
+    return @invokelatest getindex(download_info, p)
 end
 
 # precompiles to reduce latency (see https://github.com/JuliaLang/julia/pull/43990#issuecomment-1025692379)