[AArch64] Fix movk parsing with an .equ operand (#124428)
Prior to 5da801386c2b820a4596fc6d8da6b5f4a6da94b4, this code worked:
.equ p4_low_b0, 0x0000
movk x1, p4_low_b0, lsl 16
(The code above is from the isa-l project - I discovered this issue
while trying to compile it with clang 19 on MacOS on aarch64)
That commit fixed a different bug, but accidentally broke the case where
the second operand to movk is not a literal.
In 442f066fc464e953b7783230e95ccf2a67ebfb38, a fix was applied to handle
the case where the second operand is a value like "(Val) >> 16".
However, that didn't appear to fix the test case in this commit. In this
commit, we extend the change to handle the case where the second operand
is a identifier defined by .equ.
Fixes #124427
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