PR18929, PATCH: Introducing immediates with # is optional on aarch64

[Stepan Dyatkovskiy]

Hi all,
Please find patch in attachment.

Description and fix.

According to ARM assembler language hash symbol is optional before 
immediates.
For example, see here for more details:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0473j/dom1359731154529.html

Patch fixes three methods:
AArch64AsmParser::ParseFPImmOperand
AArch64AsmParser::ParseImmWithLSLOperand
AArch64AsmParser::ParseFPImm0AndImm0Operand

Tests set covers scalar and NEON operations for integer and 
floating-point case.

Thanks!

-Stepan



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