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This change updates the pow function with a newer representation which increases performance on x86.

relates to

JDK-8170430 x86 pow() stub from Intel libm is inconsistent with pow() from fdlib

JDK-8146119 java/lang/Math/PowTests.java fails on solaris-x64 using -Xcomp

JDK-8190872 Regression in Math.pow for powers of 2

JDK-8189172 Math.pow(base, 2.0) still broken.

JDK-8190869 C2: missing strength reduction of Math.pow(x, 2.0D) to x*x

JDK-8289721 Hotspot8 and Hotspot11 get different results when executing the same test case

JDK-8132207 update for x86 exp in the math lib

JDK-8139575 update for x86 log in the math lib

JDK-8143353 update for x86 sin and cos in the math lib

(4 relates to)

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