X87: [test] disable number-tostring test case for x87.

test/mjsunit/mjsunit.status

 # Copyright 2012 the V8 project authors. All rights reserved.
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 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
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@@ skipping 477 matching lines @@
 
   # Requires bigger stack size in the Genesis and if stack size is increased,
   # the test requires too much time to run.  However, the problem test covers
   # should be platform-independent.
   'regress/regress-1132': [SKIP],
 
   # Currently always deopt on minus zero
   'math-floor-of-div-minus-zero': [SKIP],
 }],  # 'arch == mips64el or arch == mips64'
 
+['arch == x87', {
+   # The result produced by Gcc on linux platform is extended 80-bit double
+   # precision and not the expected standard 64-bit double precision.
+   'number-tostring-big-integer': [SKIP],
+}],  # 'arch == x87'
+
 ##############################################################################
 ['system == windows', {
   # TODO(mstarzinger): Too slow with turbo fan.
   'big-object-literal': [SKIP],
   'math-floor-of-div': [PASS, ['mode == debug', SKIP]],
   'math-floor-of-div-nosudiv': [PASS, ['mode == debug', SKIP]],
   'unicodelctest': [PASS, ['mode == debug', SKIP]],
 
   # BUG(v8:4495).
   'es6/collections': [PASS, ['arch == ia32', FAST_VARIANTS]],
@@ skipping 146 matching lines @@
   'lithium/*': [SKIP],
   'third_party/*': [SKIP],
   'tools/*': [SKIP],
   'apply': [SKIP],
   'math-*': [SKIP],
   'unicode-test': [SKIP],
   'whitespaces': [SKIP],
 }],  # variant == wasm_traps
 
 ]