[wasm] Use a C wrapper function to calculate F64Pow.

test/mjsunit/mjsunit.status

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 182 matching lines @@
   # TODO(titzer): ASM->WASM tests on these platforms
   'wasm/asm-wasm': [PASS, ['arch in [arm, arm64, mips, mipsel, mips64, mips64el]', SKIP]],
   # TODO(branelson): Figure out why ignition + asm-wasm-stdlib fails.
   'wasm/asm-wasm-stdlib': [PASS, ['arch in [arm, arm64, mips, mipsel, mips64, mips64el] or ignition == True', SKIP]],
   'wasm/asm-wasm-literals': [PASS, ['arch in [arm, arm64, mips, mipsel, mips64, mips64el] or ignition == True', SKIP]],
   'wasm/asm-wasm-copy': [PASS, ['arch in [arm, arm64, mips, mipsel, mips64, mips64el]', SKIP]],
   'wasm/asm-wasm-deopt': [PASS, ['arch in [arm, arm64, mips, mipsel, mips64, mips64el]', SKIP]],
   'wasm/asm-wasm-switch': [PASS, ['arch in [arm, arm64, mips, mipsel, mips64, mips64el]', SKIP]],
 
   # TODO(branelson): Figure out why ignition + asm->wasm fails embenchen.
-  'wasm/embenchen/*': [PASS, ['arch == arm64', SKIP], ['ignition == True', SKIP]],
+  'wasm/embenchen/*': [PASS, ['ignition == True', SKIP]],
 
   # case-insensitive unicode regexp relies on case mapping provided by ICU.
   'es6/unicode-regexp-ignore-case': [PASS, ['no_i18n == True', FAIL]],
   'es6/unicode-regexp-ignore-case-noi18n': [FAIL, ['no_i18n == True', PASS]],
   'regress/regress-5036': [PASS, ['no_i18n == True', FAIL]],
   # desugaring regexp property class relies on ICU.
   'harmony/regexp-property-*': [PASS, ['no_i18n == True', FAIL]],
 
   # TODO(bmeurer): Flaky timeouts (sometimes <1s, sometimes >3m).
   'unicodelctest': [PASS, NO_VARIANTS],
@@ skipping 552 matching lines @@
 ##############################################################################
 ['gcov_coverage', {
   # Tests taking too long.
   'array-functions-prototype-misc': [SKIP],
 
   # Stack overflow.
   'big-array-literal': [SKIP],
 }],  # 'gcov_coverage'
 
 ]