X87: Change the test case for X87 float operations
The CL https://codereview.chromium.org/1409013004 added / changed some test cases. Some new test cases use CheckFloatEq(...) and CheckDoubleEq(...) function for result check. When GCC compiling the CheckFloatEq() and CheckDoubleEq() function, those inlined functions has different behavior comparing with GCC ia32 build and x87 build. The major difference is sse float register still has single precision rounding semantic. While X87 register has no such rounding precsion semantic when directly use register value. The V8 turbofan JITTed has exactly same result in both X87 and IA32 port. So we add the following sentence to do type case to keep the same precision. float expect = *i * *j; // *i + *j, etc. For test case "RunFloat64MulAndFloat64Add1 / RunFloat64MulAndFloat64Add2 / RunFloat64MulAndFloat64Sub1 / RunFloat64MulAndFloat64Sub2", the expected result calcaulated by GCC has difference precsion when comparing with V8 turbofan result for X87 platform. (Turbofan X87 result is the same as IA32 GCC and IA32 Turbofan). So we have to disable those four cases for X87 port. BUG= Review URL: https://codereview.chromium.org/1430943002 Cr-Commit-Position: refs/heads/master@{#31808}
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