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[AArch64][AsmParser] Fix debug output in a few instructions

Authored by c-rhodes on Jun 9 2020, 1:53 AM.

Description

[AArch64][AsmParser] Fix debug output in a few instructions

Summary:
In the parsing of BTIHint, PSBHint and Prefetch the identifier token
should be lexed after creating the operand, otherwise the StringRef is
moved before being copied and the debug output is incorrect.

Prefetch example:

$ echo "prfm   pldl1keep, [x2]" | ./bin/llvm-mc \
    -triple aarch64-none-linux-gnu -show-encoding -debug

Before:

  Matching formal operand class MCK_Prefetch against actual operand at
  index 1 (<prfop ,>): match success using generic matcher

After:

  Matching formal operand class MCK_Prefetch against actual operand at
  index 1 (<prfop pldl1keep>): match success using generic matcher

Reviewed By: david-arm

Differential Revision: https://reviews.llvm.org/D80620