[PATCH][AsmParser][MC] Allow asm parser to emit elf header flags

[Vladimir Medic]

The assembler effects changes to the ELF environment through commandline
options and inline directives. These need to be written out into the ELF
header's eflags.

The mechanism for this is through the MCELFStreamer. We have modeled the
assembler's version after the previously implemented codegen one.

I'm looking forward to your comments and remarks

Vladimir
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