Move -fvisibility-inlines-hidden to the respective compiler config

build/config/gcc/BUILD.gn

Index: build/config/gcc/BUILD.gn
diff --git a/build/config/gcc/BUILD.gn b/build/config/gcc/BUILD.gn
index 6abf1a048c93195b244630740a1bb05eddf62190..433497e1350509e8fb0b715c70876adfb21ee980 100644
--- a/build/config/gcc/BUILD.gn
+++ b/build/config/gcc/BUILD.gn
@@ -32,6 +32,16 @@ config("symbol_visibility_hidden") {
   # Note that -fvisibility-inlines-hidden is set globally in the compiler
   # config since that can almost always be applied.
   cflags = [ "-fvisibility=hidden" ]
+
+  # Visibility attribute is not supported on AIX.
+  if (current_os != "aix") {
+    cflags_cc = [
+      # Not exporting C++ inline functions can generally be applied anywhere
+      # so we do so here. Normal function visibility is controlled by
+      # //build/config/gcc:symbol_visibility_hidden.
+      "-fvisibility-inlines-hidden",
+    ]
+  }
 }
 
 # This config is usually set when :symbol_visibility_hidden is removed.