Reduce dependence on the target name

The target name can be anything with custom target specs. Matching on
fields inside the target spec is much more robust than matching on the
target name.

compiler/rustc_codegen_gcc/src/consts.rs

@@ -146,7 +146,7 @@ impl<'gcc, 'tcx> StaticCodegenMethods for CodegenCx<'gcc, 'tcx> {
 
         // Wasm statics with custom link sections get special treatment as they
         // go into custom sections of the wasm executable.
-        if self.tcx.sess.opts.target_triple.tuple().starts_with("wasm32") {
+        if self.tcx.sess.target.is_like_wasm {
             if let Some(_section) = attrs.link_section {
                 unimplemented!();
             }