Improve support for freestanding_wasm32

core/runtime/procs_wasm32.odin

@@ -3,6 +3,17 @@ package runtime
 
 @(link_name="__ashlti3", linkage="strong")
 __ashlti3 :: proc "c" (a: i64, b: i32) -> i64 {
-	// TODO(bill): __ashlti3 on wasm32
-	return a
+	input: transmute([2]i32)a
+	result: [2]i32
+	if b & 32 != 0 {
+		result[0] = 0
+		result[1] = input[0] << (b - 32)
+	} else {
+		if b == 0 {
+			return a
+		}
+		result[0] = input[0]<<b
+		result[1] = (input[1]<<b) | (input[0]>>(32-b))
+	}
+	return transmute(i64)result
 }