Enable wasm-simd f32x4 test

Use valid literal constant (old number was taken from the test that
relied on runtime coersion). Enable running the test in
buildExtractTests.js.

Author: penzn

test/wasm.simd/buildExtractTests.js

@@ -116,7 +116,7 @@ function RunFloat32x4Tests() {
     exports = new WebAssembly.Instance(mod, ffi).exports;
 
     check(1.0, "exports.func_f32x4_0");
-    check(2147483648, "exports.func_f32x4_1");
+    check(3.4028234663852886e+38, "exports.func_f32x4_1");
     check(2147483648, "exports.func_f32x4_2");
     check(-2147483648, "exports.func_f32x4_3");
 }
@@ -127,7 +127,7 @@ RunInt16x8UnsignedTests();
 RunInt16x8SignedTests();
 RunInt8x16UnsignedTests();
 RunInt8x16SignedTests();
-// FIXME broken extract_lane: RunFloat32x4Tests();
+RunFloat32x4Tests();
 
 if(passed) {
   print("Passed");

test/wasm.simd/f32x4.wasm

@@ -8,24 +8,24 @@
 		(export  "func_f32x4_0")  
 		(result f32)  
 		(f32x4.extract_lane 0
-			(v128.const i32 0x3f800000 0x7fffffff 0x4f000000 0xcf000000))
+			(v128.const i32 0x3f800000 0x7f7fffff 0x4f000000 0xcf000000))
 	) 
 	(func 
 		(export  "func_f32x4_1")  
 		(result f32)  
 		(f32x4.extract_lane 1
-			(v128.const i32 0x3f800000 0x7fffffff 0x4f000000 0xcf000000))
+			(v128.const i32 0x3f800000 0x7f7fffff 0x4f000000 0xcf000000))
 	) 
 	(func 
 		(export  "func_f32x4_2")  
 		(result f32)  
 		(f32x4.extract_lane 2
-			(v128.const i32 0x3f800000 0x7fffffff 0x4f000000 0xcf000000))
+			(v128.const i32 0x3f800000 0x7f7fffff 0x4f000000 0xcf000000))
 	) 
 	(func 
 		(export  "func_f32x4_3")  
 		(result f32)  
 		(f32x4.extract_lane 3
-			(v128.const i32 0x3f800000 0x7fffffff 0x4f000000 0xcf000000))
+			(v128.const i32 0x3f800000 0x7f7fffff 0x4f000000 0xcf000000))
 	) 
 )