Compile skwasm with better space saving flags. (#40093)

Compile skwasm with better space saving flags.

Author: eyebrowsoffire

lib/web_ui/skwasm/BUILD.gn

@@ -26,6 +26,7 @@ wasm_lib("skwasm") {
     "-sPTHREAD_POOL_SIZE=1",
     "-sALLOW_MEMORY_GROWTH",
     "-sUSE_PTHREADS=1",
+    "-lexports.js",
   ]
 
   cflags = [ "-pthread" ]
@@ -40,8 +41,8 @@ wasm_lib("skwasm") {
     ]
   } else {
     ldflags += [
-      "-O1",
-      "--closure=0",
+      "-Oz",
+      "--closure=1",
       "-flto",
       "-sEXPORTED_FUNCTIONS=[stackAlloc]",
     ]

lib/web_ui/skwasm/helpers.h

@@ -15,10 +15,8 @@ inline SkMatrix createMatrix(const SkScalar* f) {
 }
 
 inline SkRRect createRRect(const SkScalar* f) {
-  const SkScalar* twelveFloats = reinterpret_cast<const SkScalar*>(f);
-  const SkRect* rect = reinterpret_cast<const SkRect*>(twelveFloats);
-  const SkVector* radiiValues =
-      reinterpret_cast<const SkVector*>(twelveFloats + 4);
+  const SkRect* rect = reinterpret_cast<const SkRect*>(f);
+  const SkVector* radiiValues = reinterpret_cast<const SkVector*>(f + 4);
 
   SkRRect rr;
   rr.setRectRadii(*rect, radiiValues);