fix(asm/wasm): oscillator phase was causing rounding errors once large enough

gopher had fixed this, but we foolishly removed it. reintroducing fix, although this could be optional only for those who really care. ultimate size optimizers could still want to get rid of it.

tests/wasm_test_renderer.es6

@@ -85,7 +85,7 @@ if (process.argv.length <= 3) {
         }
         errorCount++
     }
-    if (errorCount > 100) {
+    if (errorCount > 200) {
         console.error("got different buffer than expected. First error at: "+(firstErrorPos/2|0)+(firstErrorPos%1," right"," left"));
         return 1;
     }