JDK-8211251 : Default mask register for avx512 instructions
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Encode AVX 512 instructions as unmasked instruction where mask register is not specified. Currently unmasked instructions are encoded using k1 register, which requires k1 to be initialized properly and also reinitialized across JNI and Runtime calls
we need to integrate all the 3 fixes JDK-8210764, JDK-8211272, and JDK-8211251 together as they depend on each other.
Read backport justification in main JDK-8210764
No new failures were found during testing of webrev.01.