Replace runTestCase with assert helpers [test/built-ins/Math]

test/built-ins/Math/clz32/Math.clz32.js

test/built-ins/Math/clz32/Math.clz32_1.js

test/built-ins/Math/clz32/Math.clz32_2.js

test/built-ins/Math/fround/Math.fround_Infinity.js

test/built-ins/Math/fround/Math.fround_NaN.js

test/built-ins/Math/fround/Math.fround_Zero.js

test/built-ins/Math/hypot/Math.hypot_Infinity.js

test/built-ins/Math/hypot/Math.hypot_InfinityNaN.js

test/built-ins/Math/hypot/Math.hypot_NaN.js

test/built-ins/Math/hypot/Math.hypot_NegInfinity.js

test/built-ins/Math/hypot/Math.hypot_NoArgs.js

test/built-ins/Math/hypot/Math.hypot_Success.js

test/built-ins/Math/hypot/Math.hypot_Success_2.js

test/built-ins/Math/hypot/Math.hypot_Zero_2.js

test/built-ins/Math/hypot/Math.hypot_lengthProp.js

test/built-ins/Math/trunc/Math.trunc_Infinity.js

test/built-ins/Math/trunc/Math.trunc_NaN.js

test/built-ins/Math/trunc/Math.trunc_NegDecimal.js

test/built-ins/Math/trunc/Math.trunc_PosDecimal.js

test/built-ins/Math/trunc/Math.trunc_Success.js