Fix ubsan errors in tests

See https://ci.chromium.org/p/v8/builders/ci/V8%20Linux64%20UBSan/7102

Change-Id: I2c6577be06dbcafe11f7911cc6b3ec4b7bea5c5a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1703764Reviewed-by: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62734}

test/cctest/wasm/test-run-wasm-simd.cc

@@ -383,7 +383,8 @@ int64_t LessEqual(double a, double b) { return a <= b ? -1 : 0; }
   void RunWasm_##name##_Impl(LowerSimd lower_simd, ExecutionTier execution_tier)
 
 // Returns true if the platform can represent the result.
-bool PlatformCanRepresent(float x) {
+template <typename T>
+bool PlatformCanRepresent(T x) {
 #if V8_TARGET_ARCH_ARM
   return std::fpclassify(x) != FP_SUBNORMAL;
 #else