OpenJDK 11: Move math classes from sun.misc.* to jdk.internal.math

This is part of merging upstream changes from OpenJDK 11.28. This CL
moves classes listed below from sun.misc to jdk.internal.math:

 * DoubleConsts.java
 * FDBigInteger.java
 * FloatConsts.java
 * FloatingDecimal.java
 * FormattedFloatingDecimal.java

Bug: 199067710
Test: m droid
Change-Id: I2d818d0b5f69ab943d7edc4c8e50e91f58f03aff
14 files changed