copyright: Change HP copyright on x86 code to be more friendly
X86: Add a common named flag for signed media operations.
X86: Create a common flag with a name to indicate high multiplies.
X86: Create a common flag with a name to indicate scalar media instructions.
X86: Implement the media average instructions.
X86: Implement the multiply and add instructions.
X86: Implement the sum of absolute differences instructions.
X86: Implement the media integer subtract instructions.
X86: Implement the integer media multiply instructions.
X86: Implement the media integer addition instructions.
X86: Put in stubs for x87, 64 bit and 128 bit SIMD instruction microcode.