Stdlib check should use the compiler used to build the bottle

Library/Homebrew/formula_installer.rb

@@ -626,12 +626,13 @@ class FormulaInstaller
     end
     FileUtils.rm_rf formula.bottle_prefix
 
+    tab = Tab.for_keg(formula.prefix)
+
     CxxStdlib.check_compatibility(
       formula, formula.recursive_dependencies,
-      Keg.new(formula.prefix), MacOS.default_compiler
+      Keg.new(formula.prefix), tab.compiler
     )
 
-    tab = Tab.for_keg(formula.prefix)
     tab.tap = formula.tap
     tab.poured_from_bottle = true
     tab.write

Library/Homebrew/tab.rb

@@ -155,11 +155,14 @@ class Tab < OpenStruct
     Options.create(super)
   end
 
+  def compiler
+    super || MacOS.default_compiler
+  end
+
   def cxxstdlib
     # Older tabs won't have these values, so provide sensible defaults
     lib = stdlib.to_sym if stdlib
-    cc = compiler || MacOS.default_compiler
-    CxxStdlib.create(lib, cc.to_sym)
+    CxxStdlib.create(lib, compiler.to_sym)
   end
 
   def build_bottle?